Possible Clues:

• PM has no hesitation going round pub -- it adds a bit of spice
• Yellowish-brown — spice
• Day that conspirator perches on tree
• Apple pie seasoning
• Sounds as if to do wrong with a Scotsman is just a matter of taste
• Spicy bark
• Con man in to the spice, strangely
• Chicken addition
• Yellowish-brown spice
• Tree one gets caught in? Then no one should climb