Detention, imprisonment (10)
I believe the answer is:
internment
This clue is a double definition.
'detention' is the first definition.
(internment is a kind of detention)
'imprisonment' is the second definition.
(I know that internment is a type of imprisonment)
(Other definitions for internment that I've seen before include "Committal" , "Precautionary measure" , "Confinement of an enemy national" , "Detention" , "Locking up" .)