A deliverer with bottle (7)

I believe the answer is:

milkman

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'a deliverer' is the definition.
(I know that milkman is a type of deliverer)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for milkman that I've seen before include "Morning deliverer" , "Float driver" , "Deliverer of dairy products" , "Man in charge of a float" , "Pint deliverer" .)

I've seen this clue in the Evening Standard.

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