Company right to arrange for a supporter (6)
I believe the answer is:
corset
'a supporter' is the definition.
(thesaurus)
'company right to arrange' is the wordplay.
'company' becomes 'co' (abbreviation).
'right' becomes 'r' (common abbreviation).
'to arrange' becomes 'set' (setting is a kind of arranging).
'co'+'r'+'set'='CORSET'
'for' acts as a link.
(Other definitions for corset that I've seen before include "Tight-fitting undergarment" , "Female undergarment" , "Shaping undergarment" , "Sector (anag)" , "Stays" .)