Crossword Genius

A pre-match fling (4)

Ross

I believe the answer is:

toss

I'm a little stuck... Click here to teach me more about this clue!

'fling' is the definition.
(I know that fling can be written as toss)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for toss that I've seen before include "Flip up into the air - coin or salad" , "Raise a little money" , "Raise a bit of money before opening" , "decision-making process" , "Throw (coin) so as to choose" .)

I've seen this clue in The Globe and Mail and The Irish News.
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