Crossword Genius

Person who's active in so many directions? Just the opposite (6)

Ross

I believe the answer is:

dynamo

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

'the opposite' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'person who's active in so many directions?' is the wordplay.
'DYNAMO' is hidden back-to-front in amongst the letters.
However, I am uncertain how this is indicated.

'just' is the link.

Can you help me to learn more?

(Other definitions for dynamo that I've seen before include "Electric current generator" , "Live wire" , "Electricity generator or vigorous person" , "energetic individual" , "One creating electricity" .)

I've seen this clue in The Guardian.
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