Spanish title put on (3)
I believe the answer is:
don
This clue is a double definition.
'spanish title' is the first definition.
(I've seen this before)
'put on' is the second definition.
('don' can be a synonym of 'put on')
(Other definitions for don that I've seen before include "European river" , "Put on or assume" , "Put on clothes like noss" , "Mafia boss" , "A mafia chief or Spanish lord" .)