Portrait at a Forbidden City gate (3)
I believe the answer is:
mao
'portrait at a forbidden city gate' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mao that I've seen before include "Chinese statesman" , "Red" , "Old Chinese "Chairman"" , "Former Chinese Chairman" , "The familiar Tse-Tung" .)