Crossword Genius

Instinctive reversal of leading vessel (3)

Ross

I believe the answer is:

gut

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'instinctive' is the definition.
(I've seen this in other clues)

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(Other definitions for gut that I've seen before include "Material for violins" , "Intestine, or the stomach" , "Part of the digestive system" , "strong feelings" , "Food processor" .)

I've seen this clue in The Times.
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