Manage a medium agency (7)
I believe the answer is:
control
'manage' is the definition.
(I know that manage has the is a more specific form of the action control)
'a medium agency' is the wordplay.
I cannot really see how this works, but
'agency' could be 'co' (abbreviation for company) and 'co' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for control that I've seen before include "Corn lot (anag.)" , "Manage command post" , "Regulate; spymaster" , "Rein" , "Direct or determine" .)