I believe the answer is:
'chuck' is the definition.
(I know that chuck can be written as toss)
This is the entire clue.
(Other definitions for toss that I've seen before include "Careless not to give this" , "Heads or tails throw" , "Flip up into the air - coin or salad" , "Throw with a light motion" , "Raise a bit of money before opening" .)