Possible Clues:

• Like a remark evoking a 'Rowr!'
• Malicious person sticking to soft drinks in bar
• Bitchy? Yes and no
• Spiteful getting claws out, perhaps?
• Vindictively tart-tongued
• Backbiting eccentric has leader downgraded
• Subtly malicious
• Bike races in island surroundings, like the Manx?
• Tart-tongued
• Chinese measure seen to be spiteful