Place for a ring in Superman’s change room (5,5)
I believe the answer is:
'room' is the definition.
(phone booth is a kind of room)
'place for a ring in superman's change' is the wordplay.
I cannot really understand how this works, but
'a' could be 'one' and 'one' is found within the answer.
'ring' could be 'o' (letter resembling a ring) and 'o' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?