Crossword Genius

Useless human intestinal pouch (8)

Ross

I believe the answer is:

appendix

(Other definitions for appendix that I've seen before include "Reference" , "Writer's addition - may be taken out in the theatre!" , "sometimes removed?" , "It's useless in the body, but useful in a book" , "often discarded in theatre" .)

I've seen this clue in The Guardian.
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