Quadruple the score (6)

I believe the answer is:

eighty

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This clue could be a double definition.

'quadruple' is the first definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?

'the score' is the second definition.
(I have seen 'Several score' mean 'eighty' so perhaps 'score' could also mean 'eighty')

Can you help me to learn more?

(Other definitions for eighty that I've seen before include "LXXX" , "'Nineteen -- Four' (novel)" , "XXC" , "Cardinal" , "Around the World in - Days (Verne)" .)

I've seen this clue in the Evening Standard.

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