Implore, entreat (5)
I believe the answer is:
plead
This clue is a double definition.
'implore' is the first definition.
(I know this)
'entreat' is the second definition.
(I know this)
(Other definitions for plead that I've seen before include "Beg, implore" , "Argue (for a cause)" , "Request" , "advocate in court" , "Appeal earnestly" .)