Adolescent limped: he’s gone over on uncovered toys (11)

'adolescent' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'limped he's gone over on uncovered toys' is the wordplay.
'limped' becomes 'hobbled' ('hobble' can be a synonym of 'limp').
'gone over' says the letters should be written backwards.
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'uncovered' indicates the central letters.
The middle letters of 'toys' are 'oy'.
'he' written backwards gives 'eh'.
'hobbled'+'eh'+'oy'='HOBBLEDEHOY'

Can you help me to learn more?