No more, please! (7)
I believe the answer is:
prithee
'please' 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 prithee that I've seen before include "Please (archaic)" , "Please - tip here (anag)" , "Please! (Old English)" , "Old request" .)