Speak as sozzled in Paris on consuming litres (4)
I believe the answer is:
slur
'speak as sozzled in' is the definition.
'slur' can be an answer for 'speak' (slurring is a kind of speaking). I'm unsure of the 'as sozzled in' bit.
'paris on consuming litres' is the wordplay.
'paris on' becomes 'sur' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'consuming' means one lot of letters goes inside another.
'litres' becomes 'L' (abbreviation).
'sur' going around 'l' is 'SLUR'.
Can you help me to learn more?
(Other definitions for slur that I've seen before include "Pronounce indistinctly or smear" , "Speak as drunk perhaps" , "Slight sound" , "Musical sign: "Run together"" , "Slight - drawl" .)