Method of deciding a drawn game (8)

I think it could be either:

Which length description are you looking for?:

3-5

tiebreak

(Other definitions for tiebreak that I've seen before include "Tennis set decider" , "Means of deciding winner after level scores" , "Game decider" , "Match decider" , "Means of settling tennis set" .)

I've seen this clue in The Times.

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