One required to put up the score (8)
I believe the answer is:
nineteen
'score' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'one required to put up' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'put' could be 'tee' (teeing is a kind of putting) and 'tee' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'the' is the link.
Can you help me to learn more?
(Other definitions for nineteen that I've seen before include "This clue's number" , "after the round, the number for the next round?" , "Prime number" , "Roman XIX" , "No. talked to the dozen" .)