Five-star Bradley (4)
I believe the answer is:
omar
'five-star bradley' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for omar that I've seen before include "- Khayyam, Pers. poet" , "and 16 Down: Persian poet" , "Arab" , "old poet" , "- Khayyam, Persian poet, astronomer and mathematician" .)