Bring to perfection in free usage (6)

I believe the answer is:

refine

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

'bring to perfection' is the definition.
I can't tell whether this defines the answer.

'in free usage' is the wordplay.
'usage' is an anagram indicator.
'in'+'free'='infree'
'infree' is an anagram of 'REFINE'.

Can you help me to learn more?

(Other definitions for refine that I've seen before include "Remove impurities or make cultured" , "Purify or improve" , "Hone" , "Cleanse from impurities" , "Make purer" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app