Beg but be charming (6)
I believe the answer is:
appeal
'beg' is the definition.
(I know that beg is a more specific form of the action plead)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for appeal that I've seen before include "Power to interest" , "Take case to higher court for review of verdict" , "Take case to higher court to challenge verdict" , "Legal procedure" , "Entreat, plead" .)