Double the score (5)
I believe the answer is:
forty
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" .)