Crossword Genius

Having no French polish! (6)

Ross

I believe the answer is:

gauche

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'polish' is the definition.
Although both the answer and definition are adjectives, I can't see how one could define the other.

I don't understand how the rest of the clue works.

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(Other definitions for gauche that I've seen before include "Lacking ease of manner (from the French)" , "careless" , "Unsophisticated and socially awkward" , "Socially awkward or tactless" , "Graceless" .)

I've seen this clue in the Evening Standard.
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