General secretary (4)
I believe the answer is:
This clue could be a double definition.
'general' is the first definition.
'secretary' is the second definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for aide that I've seen before include "Assistant to a more senior person", "Idea (anag)", "Military officer acting as assistant", "auxiliary", "Officer in attendance".)