You wouldn't seriously call it wheat (5)

I believe the answer is:

chaff

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'you' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for chaff that I've seen before include "Corn husks - worthless stuff" , "Husks - jokes" , "Corn-husks separated from the grain" , "Light banter - husks from corn" , "Separated grain husks" .)

I've seen this clue in the Evening Standard.

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