Famous man with no side about him (6)
I believe the answer is:
edison
'famous man with no side about him' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'side about him' is the wordplay.
I cannot quite see how this works, but
an anagram of 'side' is 'edis' which is located in the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for edison that I've seen before include "No side to this american inventor" , "Thomas ......, famous American inventor" , "scientist" , "Science master" , "Incandescent light inventor" .)