Emperor found in throne room (4)
I believe the answer is:
nero
'emperor' is the definition.
(Roman emperor)
'in throne room' is the wordplay.
'in' indicates a hidden word.
'NERO' is hidden in the letters of 'throne room'.
'found' is the link.
(Other definitions for nero that I've seen before include "Roman emperor who fiddled while Rome burned" , "Roman emperor infamous for his cruelty" , "Ruler" , "Roman emperor, d. AD68" , "Roman tyrant" .)