One under empty bar drinking single to pass out (6)
I believe the answer is:
birdie
'one' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'under empty bar drinking single to pass out' is the wordplay.
'under' is a charade indicator (letters next to each other).
'empty' suggests removing the centre.
'drinking' is an insertion indicator.
'single' becomes 'i' (one).
'to pass out' becomes 'die'.
'bar' with its middle taken out is 'br'.
'br' placed around 'i' is 'bir'.
'bir'+'die' is 'BIRDIE'.
Can you help me to learn more?
(Other definitions for birdie that I've seen before include "Good hole" , "One watched" , "One under in 20 across" , "One under par - watch it!" , "Golf score of one stroke under par" .)