Better cocaine for prince in bar (5)
I believe the answer is:
excel
'better' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for excel that I've seen before include "Outrival" , "Be pre-eminent" , "Do superbly well" , "Do particularly well" , "Be highly proficient" .)