Exert restraint (4)
I believe the answer is:
rein
(Other definitions for rein that I've seen before include "one's attached to a bit" , "Leather used for control in horse-riding" , "kidney?" , "Horse controller" , "Check; control" .)
I believe the answer is:
rein
(Other definitions for rein that I've seen before include "one's attached to a bit" , "Leather used for control in horse-riding" , "kidney?" , "Horse controller" , "Check; control" .)