Crossword Genius

Nick, having very old wife, finally says: 'Enter a nunnery!' (4,4)

Ross

I believe the answer is:

take vows

'enter a nunnery' is the definition.
(a woman takes vows to become a nun)

'nick having very old wife finally says' is the wordplay.
I cannot quite see how this works, but
'very' could be 'v' (abbreviation) and 'v' is present in the answer.
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is present in the answer.
'wife' could be 'w' and 'w' is found in the answer.
The remaining letters 'takes' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

I've seen this clue in The Guardian.
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