Concede oven info needs to be tweaked for pre-prepared meal (11,4)

I believe the answer is:

convenience food

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

'meal' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'concede oven info needs to be tweaked for pre-prepared' is the wordplay.
'concede oven info' anagrams to 'CONVENIENCE FOOD'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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