Knock everybody out (6)

I believe the answer is:

strike

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'knock' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for strike that I've seen before include "Work stoppage over industrial dispute" , "Withdraw labour in industrial dispute" , "Everyone out" , "Hit at a trade dispute" , "Hit - down tools" .)

I've seen this clue in The Globe and Mail.

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