Crossword Genius

Naughty nun's feat is to unzip! (8)

Ross

I believe the answer is:

unfasten

'to unzip' is the definition.

'naughty nun's feat' is the wordplay.
'naughty' indicates an anagram.
'nuns'+'feat'='nunsfeat'
'nunsfeat' is an anagram of 'UNFASTEN'.

'is' is the link.

(Other definitions for unfasten that I've seen before include "Loosen or open, say seatbelt" , "Let go" , "Nun's fate (anag.)" , "Unlock" , "Undo" .)

I've seen this clue in The Globe and Mail.
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