Non-combatant lacking distinctive features (7)
I believe the answer is:
neutral
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for neutral that I've seen before include "Renault (anag.)" , "Impartial; beige" , "Impartial; colour" , "uncommitted to either side" , "'Neither good nor evil, nor right nor wrong (7)'" .)