China has fantastic residence for ruler maybe (6)
I believe the answer is:
palace
'residence for ruler maybe' is the definition.
'china has fantastic' is the wordplay.
'china' becomes 'pal' (I've seen this before).
'has' is a charade indicator (letters next to each other).
'fantastic' becomes 'ace'.
'pal'+'ace'='PALACE'
(Other definitions for palace that I've seen before include "Royal residence" , "Royal house" , "Impressive residence of a ruler" , "Grand building" , "Royal mansion" .)