Type of company dealing with a conservative (9)
I believe the answer is:
repertory
'type of company' is the definition.
(I know that repertory is a type of theater company)
'dealing with a conservative' is the wordplay.
'dealing with' becomes 're' (regarding).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'conservative' becomes 'tory' (Tory means a member of the Conservative Party).
're'+'per'+'tory'='REPERTORY'
(Other definitions for repertory that I've seen before include "performance" , "Type of theatre" , "Collection" , "Playhouse performing a regular stock of works" .)