Permission to make a bequest (5)
I believe the answer is:
leave
I believe this clue is a double definition.
'permission' is the first definition.
(leave is permission or authorisation)
'make a bequest' is the second definition.
(thesaurus)
'to' acts as a link.
(Other definitions for leave that I've seen before include "Pull out" , "Permission (to take holidays?)" , "Furlough" , "Permission to do something" , "Permission - time off" .)