Crossword Genius

Duet with nun terribly out of key (7)

Ross

I believe the answer is:

untuned

'out of key' is the definition.
(I've seen this in another clue)

'duet with nun terribly' is the wordplay.
'with' is a charade indicator (letters next to each other).
'terribly' indicates an anagram.
'duet'+'nun'='duetnun'
'duetnun' anagrammed gives 'UNTUNED'.

(Other definitions for untuned that I've seen before include "With no fixed pitch" , "(Of piano) not adjusted" .)

I've seen this clue in The Independent.
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