Somewhat divine Roman emperor (4)
I believe the answer is:
nero
'emperor' is the definition.
(Roman emperor)
'somewhat divine roman' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'NERO' is hidden within 'divine roman'.
(Other definitions for nero that I've seen before include "Roman emperor, d. AD68" , "He's reputed to have fiddled while Rome burned" , "Roman 9" , "Roman Emperor, 54-68 AD" , "Matricidal emperor" .)