Mary Jane or Jerry? (3)
I believe the answer is:
This clue is a double definition.
'mary jane' is the first definition.
(I know that mary jane can be written as pot)
'jerry?' is the second definition.
(slang for chamber pot)
'or' acts as a link.
(Other definitions for pot that I've seen before include "Grass" , "Bowl" , "prize" , "Sink (a snooker ball)" , "Slangy cannabis" .)