Restore control, say (9)
I believe the answer is:
reinstate
'restore' is the definition.
(reinstating is a kind of restoring)
'control say' is the wordplay.
'control' becomes 'rein' (rein is a kind of control).
'say' becomes 'state' ('state' can be a synonym of 'say').
'rein'+'state'='REINSTATE'
(Other definitions for reinstate that I've seen before include "Restore, put back" , "Put back in position" , "Restore to a former condition" , "Restore to former post" , "Put back into office" .)