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Pulse started, heart failing (4)

Ross

I believe the answer is:

bean

I'm a little stuck... Click here to teach me more about this clue!

'pulse' is the definition.
(beans are a type of pulse)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bean that I've seen before include "Seed of coffee plant" , "Seed of e.g. coffee" , "kept by the counter?" , "Edible seed" , "It's often baked" .)

I've seen this clue in The Sun and The Times.
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