Lawyer and superheroes join those who collect discarded items? (10)

I believe the answer is:

scavengers

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'lawyer and superheroes join those' is the definition.
I can't judge whether this definition defines the answer.

'collect discarded items?' is the wordplay.
'collect' becomes 'scavenge' (scavenging is a kind of collecting).
'discarded items?' becomes 'rs' (I am not sure about this - if you are sure you should believe this answer much more).
'scavenge'+'rs'='SCAVENGERS'

'who' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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