Possible Clues:

• City's eco-friendly edge
• Be gentler when developing this?
• Fighter that's seen on the edge of town
• Martial arts exponent's area that's protected
• Area in which there may be no developments?
• Rebel gent in revolution protected country
• Level of martial arts skill that can't be developed outside city
• No build-up in this book penned by novelist, left devoid of content
• Writer proclaimed opinion about learner in undeveloped area?
• Feature on course before strike in protected area