Sort of jelly for boys (5)
I believe the answer is:
royal
'sort' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'of jelly for boys' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
The remaining letters 'ryal' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for royal that I've seen before include "one in palace?" , "Referring to the sovereign" , "Kingly or queenly" , "like Alonso" , "Of queens, say" .)