Potato in a can (4)
I believe the answer is:
aloo
'potato' is the definition.
(term for potato in Indian cuisine)
'a can' is the wordplay.
'can' becomes 'loo' (slang).
'a'+'loo'='ALOO'
'in' acts as a link.
(Other definitions for aloo that I've seen before include "chat in India perhaps" , "Spud" , "Potato dish" , "chat in Mumbai perhaps" , "Indian potato" .)