Litre, for example? Not so much drunk (7)
I believe the answer is:
legless
'drunk' is the definition.
(I've seen this before)
'litre for example? not so much' is the wordplay.
'litre' becomes 'l' ('l' can be a synonym of 'litre').
'for example?' becomes 'eg' ('e.g.' can be a synonym of 'for example').
'not so much' becomes 'less' (I've seen this before).
'l'+'eg'+'less'='LEGLESS'
(Other definitions for legless that I've seen before include "lacking members?" , "Mermaid is so" , "So one couldn't stand" , "Informally drunk, lacking nether limbs" , "Showing result of drinking" .)