One among many, outwardly (3)
I believe the answer is:
you
'one' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?
'among many outwardly' is the wordplay.
'among' says the answer is hidden in the clue.
'YOU' is hidden in the letters of 'many outwardly'.
Can you help me to learn more?
(Other definitions for you that I've seen before include "Personal pronoun" , "Person speaker addresses" , "The audience as addressed by speaker" , "' - - and Yours' (R4)" , "Thee" .)