Oesophagus (6)
I believe the answer is:
gullet
'oesophagus' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for gullet that I've seen before include "Food passage from mouth to stomach" , "Food-passage from mouth to stomach" , "Passage between pharynx and stomach" , "Oesophagus" , "part of canal" .)