Person who's active in so many directions? Just the opposite (6)
I believe the answer is:
dynamo
'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" .)