Crossword Genius

Perform some kind of social custom (2,3,7)

Ross

I believe the answer is:

do the honours

(Other definitions for do the honours that I've seen before include "preside at awards ceremony?" , "Play host" , "Perform a social duty for guests" , "Perform a social duty for others" , "Serve as host" .)

I've seen this clue in The Times.
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