Builds up a hundred cent and regrets it? (7)

I believe the answer is:

accrues

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

'builds up' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for accrues that I've seen before include "Grows by addition" , "profits" , "Grows by additions" .)

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.