US newspaper owner, drug dealer, carrying about 454 grams? (9)

I believe the answer is:

publisher

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'us newspaper' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for publisher that I've seen before include "damned by a duke" , "Man with many titles" , "House of books" , "Book or journal issuer" , "Eg Jonathan Cape or Hamish Hamilton" .)

I've seen this clue in The Times.

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