Plead with a person to depart (6)
I believe the answer is:
begone
'person to depart' is the definition.
I can't judge whether this defines the answer.
'plead with a' is the wordplay.
'plead with' becomes 'beg' (I've seen this in another clue).
'a' becomes 'one'.
'beg'+'one'='BEGONE'
Can you help me to learn more?
(Other definitions for begone that I've seen before include "Get away" , "Archaic command to buzz off" , "Archaic command to go away, banish" , "make himself scarce" , "get lost" .)