Restrain, repress (7)
I believe the answer is:
inhibit
I believe this is a double definition.
'restrain' is the first definition.
(inhibiting is a kind of restraining)
'repress' is the second definition.
(I know that repress is a more specific form of inhibit)
(Other definitions for inhibit that I've seen before include "Hold back" , "Endanger" , "Suppress" , "Limit the range or extent of" , "Constrain" .)