Juvenile bars philosopher on composer’s return (6,3)
I believe the answer is:
jungle gym
'juvenile bars philosopher' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'on composer's return' is the wordplay.
I cannot quite see how this works, but
'on' could be 'leg' (cricket term, fielding positions) and 'leg' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for jungle gym that I've seen is " climbing frame".)