In rugby union, this may be formed just after a tackle (4)

I believe the answer is:

ruck

(Other definitions for ruck that I've seen before include "Fight" , "Cower" , "Loose scrummage" , "Rugby scrum or crease in dress" , "Indistinguishable heap - a loose 10" .)

I've seen this clue in The Sunday Times and The Times.

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