Crossword Genius

Create proviso that's perfect (4,9)

Ross

I believe the answer is:

mint condition

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

'create proviso' is the definition.
I can't tell whether this definition defines the answer.

'perfect' is the wordplay.
I cannot quite see how this works, but
'perfect' could be 'mint' (similar in meaning) and 'mint' is found in the answer.
The remaining letters 'condition' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for mint condition that I've seen before include "Perfect unused state" , "(Of coin) original quality" , "Unused, pristine state" , "State of new coins" .)

I've seen this clue in The Irish Times.
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