Crossword Genius

Thus fix some European cosmetic (4-6)

Ross

I believe the answer is:

nail-polish

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

'cosmetic' is the definition.
(I know that nail polish is a type of cosmetic)

'thus fix some european' is the wordplay.
I cannot really understand how this works, but
'fix' could be 'nail' (I've seen this before) and 'nail' is found within the answer.
'european' could be 'polish' (Poland is in Europe) and 'polish' is present in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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