Prize boxer gets hit hard (4)
I believe the answer is:
belt
'hit hard' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for belt that I've seen before include "Broad stripe" , "See 24" , "District" , "Zone - hit" , "Zone - connecting strip" .)