Crossword Genius

I must not be involved in basic plot (4)

Ross

I believe the answer is:

plan

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'plot' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for plan that I've seen before include "Layout drawing" , "Intend" , "'Scheme, strategy (4)'" , "Scheme, design" , "Design; map" .)

I've seen this clue in The Telegraph.
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