Crossword Genius

Without heroin, less profit is generated for criminals (11)

Ross

I believe the answer is:

shoplifters

I'm a little stuck... Click here to teach me more about this clue!

'for criminals' is the definition.
(shoplifter is a kind of criminal)

I don't understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Independent.
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