A bit silly? Well, no! (3)

I believe the answer is:

ill

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'no' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'a bit silly? well' is the wordplay.
'a bit' indicates a hidden word (the answer is formed by a bit of the clue).
'ILL' can be found hidden inside 'silly well'.

Can you help me to learn more?

(Other definitions for ill that I've seen before include "Poorly" , "Not in good health" , "Shakespeare: '. . . met by moonlight'" , "Misfortune" , "Groggy" .)

I've seen this clue in the Evening Standard.

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