Older Spanish gentleman embraces one (6)
I believe the answer is:
senior
'older' is the definition.
(similar in meaning)
'spanish gentleman embraces one' is the wordplay.
'spanish gentleman' becomes 'senor' (Spanish equivalent to 'mister').
'embraces' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'senor' placed around 'i' is 'SENIOR'.
(Other definitions for senior that I've seen before include "Higher in rank or authority" , "High-ranking" , "Older in years or higher in rank" , "Higher in status" , "Elder (of two)" .)