Refreshes some pieces before new season (6)
I believe the answer is:
renews
'refreshes' is the definition.
(I've seen this before)
'some pieces before new season' is the wordplay.
'some pieces' indicates the answer is hidden within the clue (I've seen 'piece' mean this).
'RENEWS' is hidden within 'before new season'.
(Other definitions for renews that I've seen before include "Makes born again" , "Makes whole" , "Refreshes" , "Recommences" , "Establishes again" .)