Belt components the wrong way round (5)
I believe the answer is:
strap
'belt' is the definition.
(thesaurus)
'components the wrong way round' is the wordplay.
'components' becomes 'parts' (I've seen this before).
'the wrong way round' says the letters should be written in reverse.
'parts' reversed gives 'STRAP'.
(Other definitions for strap that I've seen before include "loopy band" , "Restraining fastener" , "Leather thong" , "Narrow strip of leather" , "Beat; securing band" .)