Crossword Genius

Ready to put in a word when required (6)

Ross

I believe the answer is:

prompt

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'ready' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

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(Other definitions for prompt that I've seen before include "Quick, without delay" , "Ready" , "On the dot" , "Instantaneous" , "Remind (actor) of lines" .)

I've seen this clue in The Globe and Mail.
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