Crossword Genius

Not fit to have a bit of fun properly (6)

Ross

I believe the answer is:

unwell

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

'have a bit of fun properly' is the definition.
I can't judge whether this defines the answer.

'not fit' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'fit' becomes 'well' (associated in meaning).
'un'+'well'='UNWELL'

'to' is the link.

Can you help me to learn more?

(Other definitions for unwell that I've seen before include "funny" , "Quaintly amusing" , "Indisposed" , "Out of sorts" , "Poorly" .)

I've seen this clue in the Evening Standard.
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