Crossword Genius

Completely impractical (8)

Ross

I believe the answer is:

crackpot

(Other definitions for crackpot that I've seen before include "Ridiculous" , "Fruitcake, screwball" , "Ludicrous" , "Damage utensil for informally eccentric person" , "Harebrained type" .)

I've seen this clue in The Guardian.
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