Put up in Shanghai (4)
I believe the answer is:
hang
'put up' is the definition.
(I've seen this in other clues)
'in shanghai' is the wordplay.
'in' says the answer is hidden in the clue.
'HANG' is hidden within 'shanghai'.
(Other definitions for hang that I've seen before include "Put up picture" , "Hover" , "Go to the gallows" , "Suspend (something)" , "put up in gallery" .)