British at last go teetotal before the Parisian drinking bout (6)
I believe the answer is:
bottle
'drinking bout' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'british at last go teetotal before the parisian' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'at last' indicates one should take the final letters.
'teetotal' becomes 'tt' (abbreviation).
'before' is a charade indicator (letters next to each other).
'the parisian' becomes 'le' (definite article in French).
The final letter of 'go' is 'o'.
'b'+'o'+'tt'+'le'='BOTTLE'
Can you help me to learn more?
(Other definitions for bottle that I've seen before include "intrepidity?" , "cool" , "Glass liquid container or slang courage" , "Device used by beer drinkers" , "(Drink) container" .)