Hard men saving shocking treatment for bully (6)
I believe the answer is:
hector
'bully' is the definition.
(I've seen this before)
'hard men saving shocking treatment' is the wordplay.
'hard' becomes 'h'.
'men' becomes 'or' (I've seen this in other clues).
'saving' indicates putting letters inside.
'shocking treatment' becomes 'ect' (electro-convulsive therapy).
'h'+'or'='hor'
'hor' enclosing 'ect' is 'HECTOR'.
'for' is the link.
(Other definitions for hector that I've seen before include "Bully (someone) verbally" , "Bully - son of Priam" , "Browbeat, bully" , "(To) bully (someone); Trojan warrior (Iliad)" , "Trojan prince killed by Achilles in siege of Troy" .)