Greatest ever intoxicated state, this level has never been reached before
I believe the answer is:
all time high
'never been reached before' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'greatest ever intoxicated state this level' is the wordplay.
'greatest ever intoxicated state' becomes 'alltime' (I am not sure about this - if you are sure you should believe this answer much more).
'this level' becomes 'high' (high is a kind of level).
'alltime'+'high'='ALL-TIME HIGH'
'has' is the link.
Can you help me to learn more?
(Another definition for all time high that I've seen is " Hitherto unexceeded level".)