Reminder to start the ball rolling? (3)

I believe the answer is:

cue

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'reminder' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for cue that I've seen before include "A snooker ball striker" , "Actor's signal" , "Billiards stick" , "Signal to begin - tapered stick" , "Reminder to do something" .)

I've seen this clue in the Evening Standard.

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