Anybody young but not useless (3)
I believe the answer is:
'anybody' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'young but not useless' is the wordplay.
I cannot quite see how this works, but
'young' could be 'y' and 'y' is present in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for you that I've seen before include "My solvers in general" , "Thou" , "whoever's reading this" , "' - - and Yours' (R4)" , "Thee" .)