Crossword Genius

Sound clock gives correct sign (4)

Ross

I believe the answer is:

tick

I'm a little stuck... Click here to teach me more about this clue!

I believe this is a quadruple definition!!

'sound' is the first definition.
(I know that tick is a type of sound)

'clock' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'gives' acts as a link.

'correct' is the third definition.
(a tick is used to mark an answer correct)

'sign' is the fourth definition.
(I have seen 'Sign of approval' mean 'tick' so perhaps 'sign' could also mean 'tick')

Can you help me to learn more?

(Other definitions for tick that I've seen before include "Beat" , "sign of approval from teacher" , "Blood-sucking insect or sound of old clock" , "Flash - bloodsucker" , "Check-mark or blood-sucking mite" .)

I've seen this clue in The Globe and Mail.
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