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Triathlon a novelty event? (5-6,4)

Ross

I believe the answer is:

three-legged race

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'event?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for three-legged race that I've seen before include "Sports event for pairs" , "Its entrants are bound" .)

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