Hopelessly drunk as bachelor? Bingo! (6)
I believe the answer is:
blotto
'hopelessly drunk' is the definition.
'bachelor? bingo' is the wordplay.
'bachelor?' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'bingo' becomes 'lotto' (synonyms).
'b'+'lotto'='BLOTTO'
'as' acts as a link.
(Other definitions for blotto that I've seen before include "Totally drunk" , "Stoned" , "Dead drunk" , "Three sheets to the wind" , "Blind drunk" .)