Pushing forwards (5)

I believe the answer is:

scrum

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'pushing' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scrum that I've seen before include "Feature of rugby match" , "A rugby formation for shoving" , "Rugby formation - they get down to it" , "Forwards at rugby union" , "Fracas" .)

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

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