Non crusader! (7)
I believe the answer is:
saracen
'non crusader' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for saracen that I've seen before include "old Muslim back" , "Ear scan (anag.)" , "Muslim opposing the Crusades" , "Opponent of the Crusaders" , "Muslim defender in Crusades" .)