Crossword Genius

Gratuity (3)

Ross

There are a few possibilities for this:

(Other definitions for cue that I've seen before include "Actor's line to remind another" , "Billiard stick - hint - signal" , "Signal to players" , "A snooker ball striker" , "line in speech" .)

I've seen this clue in the USA Today, The Mirror, the LA Times, the King Feature Syndicate, the Evening Standard, the Sydney Morning Herald, the Penny Press, The Irish Times, The Independent, The New York Times, The Telegraph and the Universal.
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