Man in the street polite to leaders? I'm afraid not! (8)
I believe the answer is:
Here is my best explanation:
'man in the street' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'polite to leaders? i'm afraid not' is the subsidiary indication.
'polite' becomes 'civil' ('civil' can be a synonym of 'polite').
'to leaders?' indicates taking the first letters (I've seen 'leader' mean this).
The initial letters of 'im afraid not' is 'ian'.
(Other definitions for civilian that I've seen before include "Member of a country", "Not in the armed forces", "out of service", "He's not in the clergy or military", "Not military", "Not in forces or police", "Citizen (non-military)", "One who is not a member of the forces of law and order.", "Non-combatant" and "Nonmilitary person".)