Crossword Genius

Go on, smile — that's rude new word (9)

Ross

I believe the answer is:

neologism

'new word' is the definition.

'go on smile that's rude' is the wordplay.
'that's rude' is an anagram indicator.
'go'+'on'+'smile'='goonsmile'
'goonsmile' with letters rearranged gives 'NEOLOGISM'.

(Other definitions for neologism that I've seen before include "Brexit maybe" , "Newly coined word" , "new term" , "Newly-coined word or expression" , "coinage" .)

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