Crossword Genius

That's OK but are there no thick ones? (3,4,4)

Ross

I believe the answer is:

all very fine

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

'there no thick ones?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'that's ok but are' is the wordplay.
I cannot quite understand how this works, but
'ok' could be 'fine' (synonyms) and 'fine' is present in the answer.
'are' could be 'a' (the 'are' is a metric unit of area) and 'a' is located in the answer.
This explanation may well be incorrect...

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