Spanish gentleman or benefactor (5)
I believe the answer is:
donor
'benefactor' is the definition.
(donor is a kind of benefactor)
'spanish gentleman or' is the wordplay.
'spanish gentleman' becomes 'don' (I've seen this before**).
'don'+'or'='DONOR'
(Other definitions for donor that I've seen before include "A giver, perhaps of blood" , "One contributing" , "Maker of gift" , "Giver, of blood say" , "blessed person, relatively" .)