Lower in rank
I think it could be either:
'lower in rank' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for junior that I've seen before include "Lower in rank or age" , "Low in status or rank" , "Younger or lower in rank" , "Less important" , "Lesser in age or job" .)
'lower in rank' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for demote that I've seen before include "Move down in rank" , "Move to lower status" , "Downgrade" , "Reduce to lower rank as punishment" , "Relegate" .)