Drank to excess back in storehouse (5)
I believe the answer is:
depot
'storehouse' is the definition.
(I know that storehouse can be written as depot)
'drank to excess back' is the wordplay.
'drank to excess' becomes 'toped' (I've seen this in another clue).
'back' is a reversal indicator.
'toped' written backwards gives 'DEPOT'.
'in' is the link.
(Other definitions for depot that I've seen before include "Depository for goods" , "Store for large quantities" , "Storehouse or terminus" , "Place for storing or despatching goods" , "Storehouse or main bus station (5)" .)