Doorman's beer (6)

I believe the answer is:

porter

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'beer' is the definition.
(type of beer)

I can't explain the rest of the clue.

(Other definitions for porter that I've seen before include "One fetches and carries the drink" , "Railway worker; the Ruler of the Queen's Navee (G&S)" , "Bitter beer - luggage carrier" , "Baggage-handler" , "One should have no difficulty carrying" .)

I've seen this clue in The Mirror.

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