Blind drunk (7)
I believe the answer is:
legless
'blind drunk' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for legless that I've seen before include "Drunk - dismembered?" , "As one may be after convivial time in club" , "Mermaid is so" , "as a snake" , "Showing result of drinking" .)