Dancer maybe receiving marks - wanting third judge's conclusion to be prompt (8)

I believe the answer is:

reminder

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

I can't explain the remainder of the clue.

(Other definitions for reminder that I've seen before include "note" , "Prompt, memory jog" , "Nudge" , "Memory jogger" , "Hint, suggestion" .)

I've seen this clue in The Independent.

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