Superior Spanish gentleman I accommodated (6)
I believe the answer is:
senior
'superior' is the definition.
(similar in meaning)
'spanish gentleman i accommodated' is the wordplay.
'spanish gentleman' becomes 'senor' (Spanish equivalent to 'mister').
'accommodated' means one lot of letters goes inside another.
'senor' placed around 'i' is 'SENIOR'.
(Other definitions for senior that I've seen before include "Higher in status" , "Pupil in a higher form" , "'Older, superior (6)'" , "Higher in rank or age" , "Superior - elder" .)