Exclusive company taken in by concession (5)
I believe the answer is:
scoop
'exclusive' is the definition.
('scoop' can be a synonym of 'exclusive')
'company taken in by concession' is the wordplay.
'company' becomes 'co' (abbreviation).
'taken in by' means one lot of letters goes inside another.
'concession' becomes 'sop' (sop is a kind of concession).
'co' going within 'sop' is 'SCOOP'.
(Other definitions for scoop that I've seen before include "Exclusive - ice cream server" , "Haul" , "Hollow concave utensil" , "war novel" , "Exclusive news story" .)