Possible Clues:

• Yellow-brown spice from bark of Asian tree
• Aromatic bark used as a spice
• Con-man in twisted tree
• Spicy bark of a Sri Lankan tree
• Bark spice
• Day that conspirator perches on tree
• Yellowish-brown — spice
• PM has no hesitation going round pub -- it adds a bit of spice
• Spicy stuff to read outside pub before lunch
• An aromatic spice