Officer support for late individual carrying kit to attend active duty (9)
I believe the answer is:
brigadier
'officer' is the definition.
(brigadier is a kind of officer)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for brigadier that I've seen before include "Rank above colonel" , "Army rank" , "High-ranking army officer" , "Military leader" , "Air bridge over to the military officer" .)