Crossword Genius

Neat, polite and not totally Italian (10)

Ross

I believe the answer is:

neapolitan

'italian' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for neapolitan that I've seen before include "From Naples" , "One coming from Campania" , "Three-coloured ice cream" , "Italian native" , "21 [ITALIAN]" .)

I've seen this clue in The Guardian.
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