Carry on Sergeant - the first to locally credit a bird

I believe the answer is:

stick-at-it

I'm a little stuck... Click here to teach me more about this clue!

(Another definition for stick-at-it that I've seen is " Keep on trying - adhere to task".)

I've seen this clue in the Irish 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.