Repast is transformed by tarts (8)

I believe the answer is:

pastries

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

'repast is transformed' is the wordplay.
'transformed' is an anagram indicator.
'repast'+'is'='repastis'
'repastis' with letters rearranged gives 'PASTRIES'.

'by' is the link.

Can you help me to learn more?

(Another definition for pastries that I've seen is " Bakery items".)

I've seen this clue in The Mirror.

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