Corset-making company (6)
I believe the answer is:
escort
'company' is the definition.
(I've seen this before)
'corset-making' is the wordplay.
'making' is an anagram indicator.
'corset' anagrammed gives 'ESCORT'.
(Other definitions for escort that I've seen before include "Business providing companions for an evening out" , "guide" , "Companion for social occasion" , "attendance" , "Accompany (a person)" .)