What heavy drinker did when turning up in bus station? (5)

I believe the answer is:

depot

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'bus station?' is the definition.
(bus station is a kind of depot)

I can't explain the remainder of the clue.

(Other definitions for depot that I've seen before include "Wherein bus drivers" , "Bus station in the US" , "Storage place" , "Storage base" , "Place for storing or despatching goods" .)

I've seen this clue in The Guardian.

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