The Collaborative International Dictionary of English v.0.48:

Clocklike \Clock"like`\ (kl[o^]k"l[imac]k`), a.
   Like a clock or like clockwork; mechanical.
   [1913 Webster]

         Their services are clocklike, to be set
         Backward and forward at their lord's command. --B.
                                                  Jonson.
   [1913 Webster]