Allowing activity in the property market (7)
I believe the answer is:
letting
I believe this is a double definition.
'allowing' is the first definition.
('let' can be a synonym of 'allow')
'activity in the property market' is the second definition.
(I've seen this before)
(Other definitions for letting that I've seen before include "property for temporary occupants?" , "Granting to a tenant" , "Dealing with property" , "Allowing or leasing" , "Leasing (a property)" .)