WordNet (r) 3.0 (2006):

clock in
    v 1: register one's arrival at work [syn: clock in, punch
         in, clock on] [ant: clock off, clock out, punch
         out]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "clock in":
   accomplish, achieve, approach, arrive, arrive at, arrive in,
   attain, attain to, be received, blow in, bob up, check in, come,
   come in, come to, come to hand, fetch, fetch up at, find, gain,
   get in, get there, get to, hit, hit town, make, make it, pop up,
   pull in, punch in, reach, ring in, roll in, show up, sign in,
   time in, turn up