Crossword Genius

Become fluent in language as painter and decorator? (4,6)

Ross

I believe the answer is:

nail polish

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

'decorator?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'become fluent in language as painter and' is the wordplay.
I cannot really see how this works, but
'language' could be 'polish' (Polish is an example) and 'polish' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
The remaining letters 'ail' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for nail polish that I've seen before include "digital coverage" , "cosmetic" , "digital application" .)

I've seen this clue in The Telegraph.
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