Off to get wasted (4)
I believe the answer is:
high
I believe this is a double definition.
'off' is the first definition.
(both can mean rotten)
'wasted' is the second definition.
(wasted can mean high on drugs)
'to get' acts as a link.
(Other definitions for high that I've seen before include "Western film with Gary Cooper" , "up a mountain?" , "on a trip" , "Eminent; lofty" , "Way up" .)