Great inventor with no side about him (6)

I believe the answer is:

edison

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

'great inventor' is the definition.
(I've seen this before)

'no side about him' is the wordplay.
'no side' anagrams to 'EDISON'.
However, I'm not clear how this is indicated.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for edison that I've seen before include "inventive sort" , "Thomas Alva -, US inventor" , "Prolific inventor" , "Inventor of the carbon filament lamp, d. 1931" , "Onside with great American inventor" .)

I've seen this clue in the Evening Standard.

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