Crossword Genius

Sound heard every second? (4)

Ross

I believe the answer is:

tick

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

This clue might be a double definition.

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

'heard every second?' is the second definition.
'tick' can be an answer for 'second?' (both can mean a very short amount of time). I'm not sure about the 'heard every' bit.

Can you help me to learn more?

(Other definitions for tick that I've seen before include "credit > check" , "Credit; insect" , "Make noise like old clock" , "Blood-sucking arachnid" , "Instant - credit" .)

I've seen this clue in The Sun.
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