Crossword Genius

Double the score (5)

Ross

I believe the answer is:

forty

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This clue might be a double definition.

'double' is the first definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'the score' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for forty that I've seen before include "-- winks, a short sleep" , "number of penitential days" , "Two score" , "When life begins" , "Two-score" .)

I've seen this clue in the Evening Standard.
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