Dead drunk, imbibing barely changed (8)
I believe the answer is:
adjusted
'changed' is the definition.
(adjusting is a kind of changing)
'dead drunk imbibing barely' is the wordplay.
'drunk' is an anagram indicator.
'imbibing' is an insertion indicator.
'barely' becomes 'just' ('just' can be a synonym of 'barely').
'dead' with letters rearranged gives 'aded'.
'aded' going around 'just' is 'ADJUSTED'.
(Other definitions for adjusted that I've seen before include "Changed to better fit" , "Fixed, adapted or set right" , "With small change" , "Altered slighty for accuracy" , "Altered slightly or regulated" .)