Make use of unfinished polymer plastic (6)
I believe the answer is:
employ
'make use of' is the definition.
('employ' can be a synonym of 'make use of')
'unfinished polymer plastic' is the wordplay.
'unfinished' means to remove the last letter.
'plastic' indicates anagramming the letters (plastic can mean easily moulded).
'polymer' with its last letter taken away is 'polyme'.
'polyme' anagrammed gives 'EMPLOY'.
(Other definitions for employ that I've seen before include "Take on (staff)" , "Engage or hire for work" , "Put to use" , "Give work to (someone)" , "Use or give job to" .)