Quick to feed thesps? (6)

I believe the answer is:

prompt

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'quick' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

(Other definitions for prompt that I've seen before include "Bring about; actors' help" , "Cue; punctual" , "Cause, bring about" , "Jog the memory" , "Supply a forgotten line to an actor" .)

I've seen this clue in the Sydney Morning Herald.

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