Seen in museum, a Chinese appliance (7)
I believe the answer is:
machine
'appliance' is the definition.
(thesaurus)
'seen in museum a chinese' is the wordplay.
'seen in' indicates the answer is hidden within the clue.
'MACHINE' is hidden within 'museum a chinese'.
(Other definitions for machine that I've seen before include "Powered mechanism" , "Mechanical or electrical device" , "Mechanical contrivance; engine" , "Contraption" , "Apparatus to perform a specific function" .)