Shiite leader (9)
I believe the answer is:
ayatollah
'shiite leader' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ayatollah that I've seen before include "Iranian leader" , "Muslim leader" , "High-ranking Shiite religious leader" , "Religious high-up" , "Shiite leader, possibly in 10 across" .)