Neither finishing much, each having twisted part of gut (6)

I believe the answer is:

caecum

I'm a little stuck... Click here to teach me more about this clue!

'part of gut' is the definition.
'caecum' can be an answer for 'part' (caecum is a kind of part). I'm unsure of the 'of gut' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for caecum that I've seen is " Pouch in the alimentary canal".)

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