Throw out just two useless pieces in the end (4)
I believe the answer is:
toss
'throw out' is the definition.
(I know that throw out can be written as toss)
'just two useless pieces in the end' is the wordplay.
'in the end' suggests the final letters.
The last letters of 'just two useless pieces' are 'TOSS'.
(Other definitions for toss that I've seen before include "have a restless night, perhaps" , "Fling" , "Throw lightly and casually" , "What to do with a pancake and a caber" , "Leave decision to chance" .)