House arrest restricts woman's assembly (9)
I believe the answer is:
gathering
'assembly' is the definition.
(I know that assembly can be written as gathering)
'house arrest restricts woman's' is the wordplay.
'house arrest' becomes 'gating' (gating can mean confining a student to college).
'restricts' indicates putting letters inside.
'woman' becomes 'her' (her refers to a woman).
'gating' going around 'her' is 'GATHERING'.
(Other definitions for gathering that I've seen before include "Sewing" , "Harvesting" , "Assembly; a boil" , "party" , "Understanding - crowd" .)