Loose scrum in rugby (4)

I believe the answer is:

ruck

(Other definitions for ruck that I've seen before include "Loose rugby scrum - the common crowd" , "Fight" , "A crease; loose scrum" , "Indistinguishable heap - a loose 10" , "Tightly packed crowd" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.

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