Crossword Genius

No rise for those more advanced in service (6)

Ross

I believe the answer is:

senior

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'in service' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'no rise for those more advanced' is the wordplay.
'no rise' can be anagrammed to 'SENIOR'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for senior that I've seen before include "Older or higher in standing" , "'Older, superior (6)'" , "High in rank" , "Pupil in a higher form" , "Higher in rank or age" .)

I've seen this clue in The Globe and Mail.
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