Crossword Genius

Nutter’s constant stand on marijuana (8)

Ross

I believe the answer is:

crackpot

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'nutter's' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'constant stand on marijuana' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'stand' becomes 'rack' (synonyms).
'on' says to put letters next to each other.
'marijuana' becomes 'pot' (slang term for marijuana).
'c'+'rack'+'pot'='CRACKPOT'

Can you help me to learn more?

(Other definitions for crackpot that I've seen before include "Crazy or impractical person" , "Harebrained type" , "Fruitcake, screwball" , "Eccentric; impractical" , "Informal eccentric like damaged utensil" .)

I've seen this clue in The Times.
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