Food item that can go to a woman's head? (3)

I believe the answer is:

bun

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'food' is the definition.
(bun is a kind of food)

I cannot understand how the remainder of the clue works.

(Other definitions for bun that I've seen before include "Small rounded bread or cake" , "Hairstyle, cake" , "Something from Bath or Chelsea" , "Tied hair" , "Hair in tight coil" .)

I've seen this clue in the Evening Standard.

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