Crossword Genius

Strong backing needed for this sports-day event? (3-2-3)

Ross

I believe the answer is:

tug-of-war

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'event?' is the definition.
(tug-of-war is a kind of event)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tug-of-war that I've seen before include "Contest of strength" , "Pulling contest" , "Sporting test of strength" .)

I've seen this clue in The Times.
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