Actor Epps or Sharif (4)
I believe the answer is:
omar
I believe this is a double definition.
'actor epps' is the first definition.
(I've seen this in another clue)
'sharif' is the second definition.
(I've seen this in another clue)
(Other definitions for omar that I've seen before include "Arab" , "- Khayyam, Pers. poet" , "and 16 Down: Persian poet" , "- Khayyam, Persian poet, astronomer and mathematician" , "Old caliph" .)