Allow to be leased (3)
I believe the answer is:
let
I believe this clue is a double definition.
'allow to' is the first definition.
(I've seen this in another clue)
'be leased' is the second definition.
(I've seen this in another clue)
(Other definitions for let that I've seen before include "& 15 Triple (anag.)" , "Allow; tennis fault" , "Allow or lease" , "Allow the obstruction" , "Allow; leased" .)