Sacrifice for a cause (6)

I believe the answer is:

martyr

(Other definitions for martyr that I've seen before include "One killed for their religious beliefs" , "One who gives his life for a cause" , "One killed for cause" , "One dying for their faith" , "One killed for faith" .)

I've seen this clue in the Sydney Morning Herald.

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.