Crossword Genius

Etiquette of two girls in conversation (9)

Ross

I believe the answer is:

politesse

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

I cannot understand how the rest of the clue works.

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(Other definitions for politesse that I've seen before include "formal courtesy" , "Chivalry" , "Etiquette" .)

I've seen this clue in The Sunday Times.
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