Implore one to leave (6)
I believe the answer is:
begone
'leave' is the definition.
'implore one' is the wordplay.
'implore' becomes 'beg' ('beg' can be a synonym of 'implore').
'beg'+'one'='BEGONE'
'to' acts as a link.
(Other definitions for begone that I've seen before include "Get away" , "Archaic injunction to go away" , "Archaic command to buzz off" , "Take a hike" , "get lost" .)