Possible Clues:

• Beats like a heart
• They beat the one that ends by stealing
• Beats with persistent rhythm, as heart does
• Hurts, like a headache
• Pulsates painfully
• Bothers to exercise, losing, at last, five pounds?
• Beats like Cleary's pulse, perhaps
• Though appearing gutless, steals pounds
• Cooks broths with pulses
• Pulsates with the epitome of The Troubles in 6 down