The Collaborative International Dictionary of English v.0.48:

Skelder \Skel"der\, v. t. & i. [Etymol. uncertain.]
   To deceive; to cheat; to trick. [Obs.] --B. Jonson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Skelder \Skel"der\, n.
   A vagrant; a cheat. [Obs.] --B. Jonson.
   [1913 Webster] Skeldrake