Will sever nuts to provide revolving part? (9)
I believe the answer is:
swiveller
'revolving part?' is the definition.
(something that revolves or swivels)
'will sever nuts' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'will'+'sever'='willsever'
'willsever' with letters rearranged gives 'SWIVELLER'.
'to provide' acts as a link.
(Other definitions for swiveller that I've seen before include "One twisting chair" , "Dickens character" , "found in Curiosity Shop" .)