Firm undertaking (6)
I believe the answer is:
pledge
(Other definitions for pledge that I've seen before include "Vow; security" , "Solemn undertaking" , "Give one's word" , "Plight" , "make toast" .)
I've seen this clue in The Times.
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.