Part of the small intestine (8)

I think it could be either:

Which length description are you looking for?:

duodenum

'part of the small intestine' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for duodenum that I've seen before include "Mound due, strangely, to part of the intestine" , "First part of small intestine just below stomach" .)

I've seen this clue in The Times.

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