Older or superior (6)
I believe the answer is:
senior
This clue is a double definition.
'older' is the first definition.
(synonyms)
'superior' is the second definition.
(similar in meaning)
(Other definitions for senior that I've seen before include "Higher in rank or age" , "Older in years or higher in rank" , "High in rank" , "Elder (of two)" , "Higher in status" .)