Opening property payment (4)
I believe the answer is:
rent
I believe this clue is a double definition.
'opening' is the first definition.
(I know that rent is a type of opening)
'property payment' is the second definition.
(I've seen this in another clue)
(Other definitions for rent that I've seen before include "Periodic payment as for accommodation" , "opening" , "Torn, due to landlord" , "Tear; hire fee" , "Torn apart, ripped" .)