Crossword Genius

Drank excessively back in storeroom (5)

Ross

I believe the answer is:

depot

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'storeroom' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for depot that I've seen before include "Toped (anag.)" , "Storage place" , "Place where buses and trains are kept" , "Headquarters - storehouse" , "Large storage site" .)

I've seen this clue in The Sun.
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