A winger? (9)
I believe the answer is:
extremist
'a winger?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for extremist that I've seen before include "An ultra-radical" , "Revolutionary" , "One far from moderate" , "immoderate person" , "Far left- or right-winger" .)