Crossword Genius

"Between blonde and mouse" is not a bad description (4,2,6)

Ross

I believe the answer is:

fair to medium

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

'a bad description' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'between blonde and mouse is not' is the wordplay.
I cannot quite understand how this works, but
'blonde' could be 'fair' (similar in meaning) and 'fair' is found within the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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