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How French refusal makes band turn bad (3)

Ross

I believe the answer is:

non

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

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

'how french refusal makes band' is the wordplay.
I cannot really understand how this works, but
'refusal' could be 'no' and 'no' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for non that I've seen before include "Prefix meaning negative" , "Combining form meaning not" , "Prefixed negation of a word" , "Negative French word" , "- - -stick" .)

I've seen this clue in The Irish Times.
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