Billiard stick (3)

I believe the answer is:
cue
'billiard stick' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cue that I've seen before include "Prompt; reminder" , "Sporting rod" , "Hint for a snooker or billiards striker" , "Billiard stick - hint - signal" , "Signal for action" .)