Permit, make possible (6)
I believe the answer is:
enable
This clue is a double definition.
'permit' is the first definition.
(I've seen this in another clue)
'make possible' is the second definition.
(I've seen this in another clue)
(Other definitions for enable that I've seen before include "Empower" , "Make it possible for someone to do something" , "Give power or capacity to" , "Provide with means or opportunity" , "Permit or facilitate" .)