Crossword Genius

Occasion for players to get their heads down (5)

Ross

I believe the answer is:

scrum

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for scrum that I've seen before include "Melee" , "Forwards at rugby union" , "Disorderly struggle" , "A pushy rugby formation" , "brawl" .)

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