I don't believe that story about scrapping borders! (3)

I believe the answer is:

rot

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'i don't believe that story about scrapping borders' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

This is the entire clue.

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(Other definitions for rot that I've seen before include "Decompose; rubbish" , "Rhubarb" , "Decay, go bad" , "Decay - rubbish" , "Deterioration" .)

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