Fund, as a foundation (5)
I believe the answer is:
endow
'fund as a foundation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for endow that I've seen before include "Fund" , "Provide with a permanent income, say a school" , "Give permanent income to" , "Provide with a permanent income - perhaps a college" , "Settle an income or property on" .)