China must ask about revolutionary Japanese ware (7)
I believe the answer is:
satsuma
'japanese ware' is the definition.
(type of Japanese pottery)
'china must ask about revolutionary' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'revolutionary' says the letters should be written in reverse.
'amustas' is hidden within 'china must ask'.
'amustas' backwards is 'SATSUMA'.
(Other definitions for satsuma that I've seen before include "Citrus fruit; Jap. pottery" , "that's segmented" , "A small citrus fruit" , "Easy-peeling tangerine" , "that is easily uncovered" .)