Groom's attendant (4,3)

I believe the answer is:

best man

'groom's attendant' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for best man that I've seen before include "The groom's right-hand supporter" , "Bridegroom's friend" , "Bloke participating in match" , "Key union facilitator r" , "Bridegroom's mate" .)

I've seen this clue in the Family Time, The Independent, the Sydney Morning Herald, the King Feature Syndicate, The Mirror and The Guardian.

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