Crossword Genius

A high note, discordant (3,3)

Ross

I believe the answer is:

off key

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'discordant' is the definition.
(thesaurus)

'a high note' is the wordplay.
'a high' becomes 'off' (I've seen this in other clues).
'note' becomes 'key' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'off'+'key'='OFF-KEY'

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(Other definitions for off key that I've seen before include "Inaccurate in pitch" , "Musically, not quite on the right note" , "using the wrong pitch" , "Musically, out of tune" , "played badly" .)

I've seen this clue in the Evening Standard.
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