Irish talk head off a rascal (5)
I believe the answer is:
rogue
'rascal' is the definition.
(both can mean a scoundrel)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for rogue that I've seen before include "Wild animal driven away from herd" , "Prankster" , "Old Greek" , "Diseased plant" , "Chap in gallery" .)