They say what may happen after a show of hands (8)

I believe the answer is:

palmists

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'hands' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for palmists that I've seen is " fortune-tellers".)

I've seen this clue in The Irish Independent.

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