Butt from corner disposed of outside area (8)
I believe the answer is:
hogshead
'butt' is the definition.
(both can mean a cask for alcohol)
'corner disposed of outside area' is the wordplay.
'corner' becomes 'hog' (I've seen this in other clues).
'disposed of' becomes 'shed' (shed can mean to discard or dispose of).
'outside' is an insertion indicator.
'area' becomes 'a' (maths abbreviation).
'shed' going around 'a' is 'shead'.
'hog'+'shead'='HOGSHEAD'
'from' acts as a link.
(Other definitions for hogshead that I've seen before include "Much wine" , "Provider of brawn" , "barrel" , "lot of drink" , "Large cask holding 54 gallons of beer" .)