Exra large letters sound better (5)

I believe the answer is:

excel

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

'better' is the definition.
(excel can mean to better or beat)

I can't explain the remainder of the clue.

(Other definitions for excel that I've seen before include "Do really well as at exams" , "Show brilliance" , "Be outstanding" , "cap" , "Perform outstandingly well" .)

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.