Eleven plus (6)

I believe the answer is:

twelve

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This clue might be a double definition.

'eleven' is the first definition.
(thesaurus)

'plus' is the second definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for twelve that I've seen before include "The midnight hour" , "Number of zodiac signs" , "AM/PM separator?" , "Highest number on clock" , "Number of centuries needed for MCC" .)

I've seen this clue in the Evening Standard.

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