Politician, one investing in evasive business (7)
I believe the answer is:
Here is my best explanation:
'business' is the definition.
(company is a kind of business)
'politician one investing in evasive' is the subsidiary indication.
'politician' becomes 'mp'.
'one' becomes 'an' (I've seen this in other clues).
'investing in' indicates putting letters inside.
'evasive' becomes 'coy'.
'mpan' going within 'coy' is 'company'.
(Other definitions for company that I've seen before include "Firm, concern", "Two, they say", "Group of soldiers, business", "Commercial business", "Fellowship", "See 10" and "Guests".)