Crossword Genius

Essential bag for Spooner's bun (7)

Ross

I believe the answer is:

teacake

'bun' is the definition.
(type of bun)

I don't understand how the remainder of the clue works.

(Other definitions for teacake that I've seen before include "snack" , "(Afternoon) bun" , "Fruited bun" , "Sweet thing" , "crumbs from this?" .)

I've seen this clue in The Sun and The Times.
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