Extremely drunk, in slang (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
blotto
(Other definitions for blotto that I've seen before include "Smashed" , "Plastered, hammered, sloshed" , "Boot Lt. out for being drunk" , "Cockeyed drunk" , "To bolt away slangily drunk" .)