At mine canary all aflutter in major intake (10,5)

I believe the answer is:

alimentary canal

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'major intake' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'at mine canary all aflutter' is the wordplay.
'aflutter' is an anagram indicator (I've seen this in other clues).
'at'+'mine'+'canary'+'all'='atminecanaryall'
'atminecanaryall' with letters rearranged gives 'ALIMENTARY CANAL'.

'in' acts as a link.

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 Sydney Morning Herald.

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