Gild the plastic with great pleasure! (7)
I believe the answer is:
delight
'great pleasure' is the definition.
(I've seen this before)
'gild the plastic' is the wordplay.
'plastic' indicates anagramming the letters (plastic can mean easily moulded).
'gild'+'the'='gildthe'
'gildthe' anagrammed gives 'DELIGHT'.
'with' acts as a link.
(Other definitions for delight that I've seen before include "Felicity" , "Give great pleasure to" , "See 5" , "Gladness" , "Lighted to give real pleasure" .)