Came down to half a bottle, which isn't much (6)
I believe the answer is:
little
'isn't much' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'came down to half a bottle' is the wordplay.
'came down' becomes 'lit' (light or alight can mean to land).
'to half a' indicates taking half.
'bottle' with half the letters taken is 'tle'.
'lit'+'tle'='LITTLE'
'which' is the link.
Can you help me to learn more?
(Other definitions for little that I've seen before include "Teensy-weensy" , "` `...... pitchers have big ears' '" , "Book by Dickens" , "Wee; minute" , "The Battle of ... Bighorn, Custer's last stand" .)