Crossword Genius

Required by etiquette (2,7)

Ross

I believe the answer is:

de rigueur

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

This is all the clue.

(Other definitions for de rigueur that I've seen before include "necessary" , "Proper" , "Required by strict etiquette or fashion (French)" , "Strictly" , "Required by custom or etiquette" .)

I've seen this clue in The Times.
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