Rene not swimming in canal (7)
I believe the answer is:
enteron
'canal' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'rene not swimming' is the wordplay.
'swimming' indicates an anagram (letters swim around into a new order).
'rene'+'not'='renenot'
'renenot' with letters rearranged gives 'ENTERON'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for enteron that I've seen before include "gut" , "Begin; engage in" , "Open" , "element of guts" .)