Ilhan of Congress (4)
I believe the answer is:
omar
'ilhan of congress' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for omar that I've seen before include "- - Sharif (films)" , "- Sharif, film actor" , "Arab" , "Old caliph" , "- Khayyam, Persian poet, astronomer and mathematician" .)