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Idea impracticable, I gathered (6)

Ross

I believe the answer is:

notion

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'idea' is the definition.
(I know that notion is a type of idea)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for notion that I've seen before include "Idea or fancy" , "Vague impression" , "A vague and possibly incorrect opinion" , "Vague or whimsical idea" , "Concept, belief" .)

I've seen this clue in The Times.
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