Crossword Genius

Open (a fastener) (5)

Ross

I believe the answer is:

unzip

'open a fastener' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for unzip that I've seen before include "Unfasten" , "Loosen fastening" , "Loosen (trousers?)" , "Undo trousers" , "Release covering (or trousers?)" .)

I've seen this clue in The Guardian and The Times.
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