Crossword Genius

Many do upset supplier of power (6)

Ross

I believe the answer is:

dynamo

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

'supplier of power' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'many do upset' is the wordplay.
'upset' indicates anagramming the letters.
'many'+'do'='manydo'
'manydo' is an anagram of 'DYNAMO'.

Can you help me to learn more?

(Other definitions for dynamo that I've seen before include "Device producing electrical power" , "Electricity generator or energetic person" , "Tirelessly energetic type" , "Juice supplier" , "Small generator" .)

I've seen this clue in The Mirror.
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