Pitch — what happens on one before match? (4)
I believe the answer is:
toss
'pitch' is the definition.
(I know that pitch can be written as toss)
I don't understand the rest of the clue.
(Other definitions for toss that I've seen before include "Spin of a coin" , "Flip; hurl" , "Heads or tails throw" , "Fling" , "cast" .)