The score of the century (3)
I believe the answer is:
ton
This could be a double definition.
'the score' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'century' is the second definition.
(both can mean one hundred of something)
'of the' is the link.
Can you help me to learn more?
(Other definitions for ton that I've seen before include "U nit of weight" , "Two thousand, two hundred and forty lbs avoirdupois" , "Fashionable" , "Unit of weight equivalent to 20 cwts" , "Style" .)