Expose firm: note result (7)
I believe the answer is:
outcome
'result' is the definition.
('outcome' can be a synonym of 'result')
'expose firm note' is the wordplay.
'expose' becomes 'out' (outing is a kind of exposing).
'firm' becomes 'co' (a firm is a company).
'note' becomes 'me'.
'out'+'co'+'me'='OUTCOME'
(Other definitions for outcome that I've seen before include "Consequence, upshot" , "'Result, upshot (7)'" , "End result" , "Eventuality" , "answer" .)