Ruin contribution to Nessun Dorma? (4)

I believe the answer is:

undo

'ruin' is the definition.
(thesaurus)

'contribution to nessun dorma?' is the wordplay.
'contribution to' indicates a hidden word.
'UNDO' is hidden in the letters of 'nessun dorma'.

(Other definitions for undo that I've seen before include "Unfasten - destroy" , "Disentangle" , "set free" , "Bring to nought" , "Ruin or loose" .)

I've seen this clue in The Times.

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