Plastic container of wine (4)
I believe the answer is:
asti
'wine' is the definition.
(Italian wine)
'plastic container' is the wordplay.
'container' says the answer is hidden in the clue.
'ASTI' is hidden within 'plastic'.
'of' is the link.
(Other definitions for asti that I've seen before include "town in Italy" , "Source of fizz" , "Alcohol" , "Italian wine - (then change a letter for ...)" , "Sparkling drink" .)