The most common and most likely answer to this crossword clue is the 11 letter word TIEBREAKERS
I've seen this crossword clue in The Daily Telegraph
T
I
E
B
R
E
A
K
E
R
S
More clues leading to the result TIEBREAKERS
Buddy explains!
The straight part
We know that "They’ll resolve who wins" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’ll resolve who wins = tiebreakers.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TIEBREAKERS mean?
TIEBREAKERS noun- Something that is used to pick a winner from a tied situation.