Very good to forget Lent? Do better! (5)
I believe the answer is:
excel
'do better' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for excel that I've seen before include "Be exceptionally good (at something)" , "surpass all others" , "Do brilliantly" , "Be pre-eminent" , "Do better than, give great performance" .)