I will leave older Spaniard (5)
I believe the answer is:
senor
'spaniard' is the definition.
('mister' in Spanish)
'i will leave older' is the wordplay.
'will leave' suggests deleting specific letters.
'older' becomes 'senior' (similar in meaning).
'senior' with 'i' taken away is 'SENOR'.
(Other definitions for senor that I've seen before include "Snore (anag.)" , "Snore like Spanish gent" , "Norse (anag.)" , "Man in Havana ?" , "Snore like Spaniard" .)