Hint learner found out stimulus to action (3)

I believe the answer is:

cue

I'm a little stuck... Click here to teach me more about this clue!

'hint' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for cue that I've seen before include "Snooker player's stick" , "Sports implement" , "Signal to begin - tapered stick" , "Hint on stage" , "Snooker rod" .)

I've seen this clue in The Irish Independent.

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