Make sure (5)

I think it could be either:

Which length description are you looking for?:

check

'make sure' is the definition.
(synonyms)

This is all the clue.

(Other definitions for check that I've seen before include "retard!" , "Investigate; rein in" , "Refrain or verify" , "Investigate; stop" , "Verify; restrain" .)

I've seen this clue in The Mirror.

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