Possible Clues:

• Renegade Tory regularly meeting top Conservative leaders
• Rotter with knack of turning up and organising riot
• Rat's characteristic yellow pigment
• It's an innate quality: in other words, you can't trust him
• Betrayer of a cause
• It's characteristid, or it's not true that one is
• One betraying one's country
• That is characteristic or will let you down
• Distinguishing feature old King Rat displayed
• Has one got the air to trot with? Faith, one hasn't