Short-lived supporter (6)
I believe the answer is:
second
This clue is a double definition.
'short-lived' is the first definition.
(I've seen this before)
'supporter' is the second definition.
(I know that second is a type of attendant)
(Other definitions for second that I've seen before include "Mo" , "Unit of time - after No 1" , "Short time; subordinate" , "awarded the silver medal?" , "Basic unit of time" .)