Crossword Genius

Dessert that may go off, say? (5)

Ross

I believe the answer is:

bombe

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'dessert' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for bombe that I've seen before include "Ice cream frozen in a round mould" , "Sweet" , "Ice-cream dessert" , "like some rounded furniture" , "Dome-shaped dessert, often frozen" .)

I've seen this clue in The Mirror.
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