Crossword Genius

Threaten delay (8)

Ross

I believe the answer is:

holdover

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'delay' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

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

Can you help me to learn more?

(Another definition for holdover that I've seen is " Postpone".)

I've seen this clue in The Irish Times.
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