Bet on three racers in TT race and F1 broadcast (8)

I believe the answer is:

trifecta

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'racers in tt race and f1 broadcast' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'bet on three' is the wordplay.
I cannot quite see how this works, but
'three' could be 'tri' (prefix meaning 'three') and 'tri' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

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