Crossword Genius

Breadhead's snack? (8)

Ross

I believe the answer is:

doughnut

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'snack?' is the definition.
(doughnut is a type of snack)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for doughnut that I've seen before include "Small circular cake" , "Sweet circular snack" , "Toroid" , "Jam-filled cake" , "Fried batter cake" .)

I've seen this clue in The Telegraph.
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