Spades used in check for tree product (5)
I believe the answer is:
'tree product' is the definition.
(I've seen this in another clue)
'spades used in check' is the wordplay.
'spades' becomes 's' (abbreviation in card games).
'used in' means one lot of letters goes inside another.
'check' becomes 'rein' (both can mean to control or limit).
's' placed into 'rein' is 'RESIN'.
'for' acts as a link.
(Other definitions for resin that I've seen before include "Cannabis, say" , "Viscous fluid from tree sap" , "Sticky exudation from trees" , "Sticky substance exuded by pine trees" , "Material exuded from tree" .)