Company letters about Italian wine’s non-ecological packaging (7)
I believe the answer is:
plastic
'non-ecological packaging' is the definition.
(non-eco-friendly packaging)
'company letters about italian wine's' is the wordplay.
'company letters' becomes 'plc' (public limited company).
'about' means one lot of letters goes inside another.
'italian wine' becomes 'asti' (Asti is a type of Italian wine).
'plc' placed around 'asti' is 'PLASTIC'.
(Other definitions for plastic that I've seen before include "Credit cards etc" , "Credit cards are known as ....... money" , "Artificial; easily moulded" , "Euphemism for a credit card" , "Fashionable - substitute for wood or metal" .)