Crowd turmoil with fellow knocked out by clubs (7)

I believe the answer is:

cluster

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'crowd' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for cluster that I've seen before include "Thick grouping of similar things" , "Assemblage" , "Close group of things" , "Tight group of like things" , "group together" .)

I've seen this clue in The Times.

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