One story’s no good about designated victim (5)

I believe the answer is:

isaac

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'designated victim' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for isaac that I've seen before include "one almost sacrificed" , "- Newton, Eng. physicist and mathematician" , "Hebrew patriarch" , "Abraham's son" , "Abraham, --, Jacob" .)

I've seen this clue in The Times.

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