Prepared to be fired for being drunk (6)

I believe the answer is:

loaded

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

I don't understand how the rest of the clue works.

(Other definitions for loaded that I've seen before include "Rolling" , "Of gun, containing bullets" , "Slangily rich or with bullets in place" , "Big Bertha sometimes was" , "Rich - drunk - with a heavy burden" .)

I've seen this clue in the Evening Standard.

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