Crossword Genius

Second sound? (4)

Ross

I believe the answer is:

tick

'second sound?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tick that I've seen before include "Make noise like old clock" , "Beat" , "Check mark" , "Mark of work done (right)" , "Not cross" .)

I've seen this clue in The Wall Street Journal.
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