Crossword Genius

Mark indicating correctness (4)

Ross

I believe the answer is:

tick

'mark indicating correctness' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tick that I've seen before include "Second" , "Parasite - mark of approval" , "Check the small mattress?" , "Blood-sucking mite or parasitic insect" , "Mark of work done (right)" .)

I've seen this clue in The Sun.
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