A tip for the waiters, you say (3)

I believe the answer is:

cue

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'a tip' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for cue that I've seen before include "Hint, prompt" , "Signal to players" , "Snooker player's stick" , "Signal for action" , "State of collapse, disaster" .)

I've seen this clue in the Evening Standard.

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