"Hands up" time (6)

I believe the answer is:

twelve

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

'hands up time' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for twelve that I've seen before include "Basis of duodecimal system" , "XII" , "Last hour" , "The midnight hour" , "Number of zodiac signs" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.