Crossword Genius

Operate a cam internally to follow a course of lunch? (10,5)

Ross

I believe the answer is:

alimentary canal

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

'course of lunch?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'operate a cam internally to follow a' is the wordplay.
'operate' indicates anagramming the letters.
'to follow' is a charade indicator (letters next to each other).
'a'+'cam'+'internally'='acaminternally'
'acaminternally' with letters rearranged gives 'limentarycanal'.
'limentarycanal' after 'a' is 'ALIMENTARY CANAL'.

Can you help me to learn more?

(Another definition for alimentary canal that I've seen is " gut".)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app