Crossword Genius

Open feast nun prepared (8)

Ross

I believe the answer is:

unfasten

'open' is the definition.
(unfastening is a kind of opening)

'feast nun prepared' is the wordplay.
'prepared' is an anagram indicator.
'feast'+'nun'='feastnun'
'feastnun' with letters rearranged gives 'UNFASTEN'.

(Other definitions for unfasten that I've seen before include "Nun's fate (anag.)" , "Let go" , "tie? No" , "Loosen or open, say seatbelt" , "Unlock" .)

I've seen this clue in The Telegraph.
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