Crossword Genius

Cooked bird - I ate a mouthful (8)

Ross

I believe the answer is:

diatribe

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'a mouthful' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'cooked bird i ate' is the wordplay.
'cooked' indicates an anagram.
'bird'+'i'+'ate'='birdiate'
'birdiate' with letters rearranged gives 'DIATRIBE'.

Can you help me to learn more?

(Other definitions for diatribe that I've seen before include "Torrent of abuse" , "I debar it, being a violent attack in words" , "Insults" , "Bitter critical attack" , "Stream of invective" .)

I've seen this clue in The Telegraph.
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