Crossword Genius

Oh, her? She sounds a bit of all right! (3)

Ross

I believe the answer is:

kay

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

'bit of all right' is the definition.
The definition suggests a singular noun which matches the answer.

'oh her? she sounds a' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
The remaining letters 'ky' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for kay that I've seen before include "K" , "Eleventh letter; girl's name" .)

I've seen this clue in the Evening Standard.
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