Crossword Genius

As one might be, having confused note with four others? (4,4)

Ross

I believe the answer is:

tone deaf

I'm a little stuck... Click here to teach me more about this clue!

'as one' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'having confused note with four others?' is the wordplay.
I cannot really understand how this works, but
an anagram of 'note' is 'tone' which is within the answer.
The remaining letters 'deaf' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'might be' acts as a link.

Can you help me to learn more?

(Other definitions for tone deaf that I've seen before include "insensitive to pitch" , "no ear?" , "not appreciative of notes?" .)

I've seen this clue in The Times.
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