Crossword Genius

When hands are raised (6)

Ross

I believe the answer is:

twelve

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'when hands' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

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

'are' is the link.

Can you help me to learn more?

(Other definitions for twelve that I've seen before include "Midnight or noon" , "One under a baker's dozen" , "Apostles and members of the jury" , "Basis of duodecimal system" , "Number of centuries needed for MCC" .)

I've seen this clue in the Evening Standard.
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