What can run on green power, after replacing lead (5)

I believe the answer is:

mower

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'what can run on green' is the definition.
(a lawnmower might be used on a green)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mower that I've seen before include "Grass-cutter" , "Grass cutter" , "Gardening equipment" , "Tool for cutting grass" , "Patrick _; Rodney Blackstock in Emmerdale" .)

I've seen this clue in The Times.

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