Old Turkish title for a civil or military leader (4)

I believe the answer is:

agha

(Other definitions for agha that I've seen before include "Turkish officer" , "Turkish civil or military leader" , "Ruler" , "Alternative spelling for a Turkish commander" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.