Bet against heavy odds (4,4)

I think it could be either:

Which length description are you looking for?:

4,4

long shot

(Other definitions for long shot that I've seen before include "Attempt at goal from half-way line" , "What paparazzi might get" , "An undertaking with little chance of success" , "bet that could bring big return" , "One has only the slightest chance of succeeding" .)

I've seen this clue in The Mirror.

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