One fated to be treated as musically incompetent (4-4)

I believe the answer is:

tone-deaf

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'musically incompetent' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'one fated to be treated' is the wordplay.
'to be treated' indicates an anagram.
'one'+'fated'='onefated'
'onefated' is an anagram of 'TONE-DEAF'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for tone-deaf that I've seen before include "Without musical appreciation" , "Unable to distinguish variations in musical pitch" , "Unable to discriminate between musical notes" , "Unable to perceive differences of musical pitch" , "Fade note? (anag.)" .)

I've seen this clue in The Independent.

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