Game of chance after bishop gets hopelessly drunk (6)
I believe the answer is:
Here is my best explanation:
'hopelessly drunk' is the definition.
'game of chance after bishop' is the subsidiary indication.
'game of chance' becomes 'lotto'.
'after' is a charade indicator (letters next to each other).
'bishop' becomes 'b' (abbreviation used in chess).
'lotto' after 'b' is 'blotto'.
'gets' is the link.
(Other definitions for blotto that I've seen before include "In slang, very drunk", "To bolt away in drunk state", "Boot Lt. out for being drunk", "Smashed", "Three sheets to the wind", "Dead drunk", "Drunk", "Helplessly drunk (slang)", "Slangily drunk - ready to bolt" and "Unconscious from drink".)