Score but two (8)
I believe the answer is:
eighteen
This clue could be a double definition.
'score' is the first definition.
The answer and definition can be both quantities as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'two' is the second definition.
The answer and definition can be both quantities as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'but' is the link.
Can you help me to learn more?
(Other definitions for eighteen that I've seen before include "Minus one [19A]" , "1.5 dozen" , "Treble six" , "Last golf hole number" , "Nine times two" .)