Stomach or guts (5)

I believe the answer is:

nerve

(Other definitions for nerve that I've seen before include "Fibre that transmits instructions to the brain" , "Intrepidity" , "Impudence; sensory fibre" , "Cheek; self-possession" , "Bundles of fibres in the body that transmit instructions" .)

I've seen this clue in the LA Times.

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