Give Spanish nobleman a note (6)
I believe the answer is:
donate
'give' is the definition.
(donating is a kind of giving)
'spanish nobleman a note' is the wordplay.
'spanish nobleman' becomes 'don' (I've seen this before).
'note' becomes 'te'.
'don'+'a'+'te'='DONATE'
(Other definitions for donate that I've seen before include "Give as a gift as to charity" , "Contribute (to charity)" , "Fork out" , "Give (transplant organ)" , "give in kindness" .)