Crossword Genius

Unaware that one has the wrong key? (4-4)

Ross

I believe the answer is:

tone-deaf

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'unaware' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'one has the wrong key?' is the wordplay.
'has' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'wrong key?' becomes 'deaf' (I can't explain this - if you can you should give a lot more credence to this answer).
'one' put after 't' is 'tone'.
'tone'+'deaf'='TONE-DEAF'

'that' is the link.

Can you help me to learn more?

(Other definitions for tone-deaf that I've seen before include "Unable to distinguish variations in musical pitch" , "Musically challenged" , "Unable to perceive differences of musical pitch" , "Unable to perceive musical pitch accurately" , "To deafen? (anag)" .)

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