Appear to be entertained by Chinese emperor (4)
I believe the answer is:
seem
'appear to be' is the definition.
(I've seen this before)
'entertained by chinese emperor' is the wordplay.
'entertained by' indicates a hidden word (the clue hosts or entertains the answer).
'SEEM' is hidden within 'chinese emperor'.
(Other definitions for seem that I've seen before include "Appear to the eye" , "Appear, look" , "Come across as" , "Appear, give impression of being" .)