Older or higher in rank (6)
I believe the answer is:
senior
I believe this clue is a double definition.
'older' is the first definition.
(synonyms)
'higher in rank' is the second definition.
(I've seen this before)
(Other definitions for senior that I've seen before include "Being old" , "Higher in rank or authority" , "Higher in status" , "High-ranking" , "Superior - elder" .)