Unlock (4)

I believe the answer is:

open

'unlock' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for open that I've seen before include "Allowing access" , "Undo; ready for business" , "Unfasten" , "Undo; ajar" , "Candid or unlocked" .)

I've seen this clue in the Newsday, the Evening Standard, The Telegraph, The Star Tribune and The Mirror.

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