Deputy Prime Minister’s a bundle of energy (6)

I believe the answer is:

dynamo

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But I can't explain it at all! Could you help me understand?

(Other definitions for dynamo that I've seen before include "something electrifying" , "Converter of mechanical to electrical energy" , "Machine" , "Generator of electricity on Monday" , "Live wire" .)

I've seen this clue in The Hindu.

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