Drunk fairly good after swallowing quantity of drink? (6)
I believe the answer is:
tiddly
'drunk' is the definition.
(thesaurus)
'swallowing quantity of drink?' is the wordplay.
'swallowing' means one lot of letters goes inside another.
'quantity' becomes 'dl' (dl is a kind of quantity).
'of drink?' becomes 'tidy' (I can't justify this - if you can you should believe this answer much more).
'dl' placed into 'tidy' is 'TIDDLY'.
'fairly good after' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for tiddly that I've seen before include "A little drunk" , "Merry" , "Woozy" , "Drunk (as winks?)" , "Tiny" .)