Group instruction to waiter (5)

I believe the answer is:

order

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'group instruction' is the definition.
'order' can be an answer for 'instruction' (an order to do something). I am not sure about the 'group' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for order that I've seen before include "It could be the usual" , "Direct - sequence" , "association" , "Regular or proper arrangement" , "demand" .)

I've seen this clue in The Sun.

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