Beg, implore (5)
I believe the answer is:
plead
I believe this clue is a double definition.
'beg' is the first definition.
(I know that beg is a more specific form of plead)
'implore' is the second definition.
(I know that implore is a more specific form of plead)
(Other definitions for plead that I've seen before include "Argue (for a cause)" , "Make an emotional appeal" , "Argue (a position in court)" , "Beg, implore" , "Respond to charge" .)