Under those responsible for hearing, usual suspect must gather broken bits of bar (8)

I believe the answer is:

subaural

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'hearing usual suspect must gather broken bits of bar' is the definition.
I can't tell whether this definition defines the answer.

'under those' is the wordplay.
'under' becomes 'sub' (I've seen this before).
'those' becomes 'aural' (I can't explain this - if you can you should believe this answer much more).
'sub'+'aural'='SUBAURAL'

'responsible for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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