The Collaborative International Dictionary of English v.0.48:

Clod \Clod\ (kl[o^]d), v. i.
   To collect into clods, or into a thick mass; to coagulate; to
   clot; as, clodded gore. See Clot.
   [1913 Webster]

         Clodded in lumps of clay.                --G. Fletcher.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clod \Clod\, v. t.
   1. To pelt with clods. --Jonson.
      [1913 Webster]

   2. To throw violently; to hurl. [Scot.] --Sir W. Scott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clod \Clod\ (kl[o^]d), n. [OE. clodde, latter form of clot. See
   Clot.]
   1. A lump or mass, especially of earth, turf, or clay. "Clods
      of a slimy substance." --Carew. "Clods of iron and brass."
      --Milton. "Clods of blood." --E. Fairfax.
      [1913 Webster]

            The earth that casteth up from the plow a great
            clod, is not so good as that which casteth up a
            smaller clod.                         --Bacon.
      [1913 Webster]

   2. The ground; the earth; a spot of earth or turf.
      [1913 Webster]

            The clod
            Where once their sultan's horse has trod. --Swift.
      [1913 Webster]

   3. That which is earthy and of little relative value, as the
      body of man in comparison with the soul.
      [1913 Webster]

            This cold clod of clay which we carry about with us.
                                                  --T. Burnet.
      [1913 Webster]

   4. A dull, gross, stupid fellow; a dolt --Dryden.
      [1913 Webster]

   5. A part of the shoulder of a beef creature, or of the neck
      piece near the shoulder. See Illust. of Beef.
      [1913 Webster]

WordNet (r) 3.0 (2006):

clod
    n 1: a compact mass; "a ball of mud caught him on the shoulder"
         [syn: ball, clod, glob, lump, clump, chunk]
    2: an awkward stupid person [syn: lout, clod, stumblebum,
       goon, oaf, lubber, lummox, lump, gawk]

Moby Thesaurus II by Grady Ward, 1.0:

164 Moby Thesaurus words for "clod":
   Boeotian, Chateaubriand, Neanderthal, acres, alluvion, alluvium,
   anatomy, arable land, ass, batch, blade roast, block, blockhead,
   blunderer, blunderhead, body, bones, boob, boor, botcher, breast,
   brisket, bucolic, bulk, bumbler, bumpkin, bungler, carcass, chuck,
   chuck roast, chump, chunk, clay, clodhopper, clodknocker, clot,
   clown, clump, cold cuts, corpus, country bumpkin, crust, dimwit,
   dirt, dolt, donkey, dope, dry land, dullard, dumb cluck, dumbbell,
   dummy, dunce, dust, earth, farmer, figure, filet mignon, flank,
   flesh, fool, form, frame, freehold, fumbler, gawk, gawky, glebe,
   gob, gowk, grassland, ground, hayseed, hick, hillbilly, hulk,
   hunch, hunk, idiot, jerk, jobbernowl, klutz, knuckle, lackwit,
   lamebrain, land, landholdings, lightweight, lithosphere, loaf,
   loin, looby, loon, lout, lubber, lummox, lump, marginal land, marl,
   mass, material body, mold, niais, nincompoop, ninny, ninnyhammer,
   nitwit, noddy, nugget, oaf, ox, pat, person, physical body,
   physique, plate, plate piece, pot roast, put, quantity, rack,
   real estate, real property, region, regolith, rib roast, ribs,
   roast, rolled roast, round, rube, rump, rump roast, rustic, saddle,
   shank, short ribs, shoulder, shoulder clod, simpleton, sirloin,
   slouch, slubberer, sod, soil, soma, stupid, subaerial deposit,
   subsoil, tenderloin, terra, terra firma, terrain, territory,
   the country, thickwit, topsoil, torso, trunk, vegetable, wad,
   witling, woodland, yokel