A belt is something you wear (4)
I believe the answer is:
sock
This clue might be a double definition.
'a belt' is the first definition.
(both can mean to hit)
'something you wear' is the second definition.
I know that 'wear' relates to this answer.
'is' is the link.
Can you help me to learn more?
(Other definitions for sock that I've seen before include "one with wind" , "Woollen footwear" , "Foot-covering" , "Foot covering" , "This partly protects member" .)