The Collaborative International Dictionary of English v.0.48:
Click \Click\ (kl[i^]k), v. i. [imp. & p. p. Clicked (kl[i^]kt); p. pr. & vb. n. Clicking.] [Prob. an onomatopoetic word: cf. OF. cliquier. See Clack, and cf. Clink, Clique.] To make a slight, sharp noise (or a succession of such noises), as by gentle striking; to tick. [1913 Webster] The varnished clock that clicked behind the door. --Goldsmith. [1913 Webster]