Part of sleeve or belt (4)
I believe the answer is:
cuff
I believe this is a double definition.
'part of sleeve' is the first definition.
('cuff' is part of 'sleeve')
'belt' is the second definition.
(both can mean to hit)
'or' is the link.
(Other definitions for cuff that I've seen before include "Blow - it's on shirt!" , "Sleeve ending" , "Smack; Moonstone sergeant" , "by one hand" , "clout" .)