Possible Clues:

• Non-belligerent condition is enshrined in treaty
• Peaceful chap I beat back with hand clenched
• Anti-war literary genre getting no opening in time gone by
• Anti-war protester curtailed agreement, one with weapon in hand?
• Not advocating war, if one's in treaty
• Father in charge lifting clenched hand — he's no fighter
• Condition is put into agreement for one seeking to avoid conflict
• One opposes violence and refuses to take part in war
• Reluctant fighter I beat up means to punch
• Shunner of violence