British exhibit Indian's pot (5)
I believe the answer is:
bhang
'pot' is the definition.
(bhang is a kind of pot)
'british exhibit indian's' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'exhibit indian' becomes 'hang' (I can't justify this - if you can you should believe this answer much more).
'b'+'hang'='BHANG'
Can you help me to learn more?
(Other definitions for bhang that I've seen before include "cannabis" , "Hemp-based narcotic" , "Leaves and shoots of hemp" , "Narcotic used in India" .)