Dismiss those in attendance (7)

I believe the answer is:

turnout

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'attendance' is the definition.
(I know that turnout is a type of attendance)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for turnout that I've seen before include "all the voters" , "Numbers attending an event" , "those who showed up for meeting" , "The crowd appearing at an event" , "assembly" .)

I've seen this clue in The Times.

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