Crossword Genius

Returning the cakes would be an insult (4)

Ross

I believe the answer is:

buns

I'm a little stuck...
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Here is my best explanation:

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

I cannot understand how the remainder of the clue works.

Ross

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This clue was last seen in Evening Standard

(Other definitions for buns that I've seen before include "Food items", "Cakes" and "Small rolls".)

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