Pushers might supply these in piano bars (5)

I believe the answer is:

prods

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'pushers might supply these' is the definition.
The definition suggests an adverb but the answer is not.

'piano bars' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'bars' becomes 'rods' (I can't explain this - if you can you should give a lot more credence to this answer).
'p'+'rods'='PRODS'

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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