Gut feeling vague when Di vanishes (8)

I believe the answer is:

instinct

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'gut feeling' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for instinct that I've seen before include "Inborn impulse or tendency 8)" , "Innate behaviour" , "Natural impulse governing behaviour" , "Natural tendency" , "Innate reaction" .)

I've seen this clue in The Sun.

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