Possible Clues:

• Bewildered curmudgeon surrendering gun - that's proper behaviour
• Sense of propriety
• Bang on about Italian author's good manners
• Good form last month nothing unusual
• Proper behaviour of French company -- odd!
• Endless lure shown by strange modesty
• Proper conduct
• Not harming the environment in Scottish ridge shows good behaviour
• This is becoming green, in part of the ear
• Good behaviour last month, no booze