Crossword Genius

Knock a self-service arrangement (6)

Ross

I believe the answer is:

buffet

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'knock' is the definition.
(thesaurus)

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(Other definitions for buffet that I've seen before include "Wallop" , "Self-service meal; strike" , "place selling snacks" , "Refreshment counter - slap" , "Variety of restaurant" .)

I've seen this clue in The Daily Express.
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