Pudding that may go off, say? (5)

I believe the answer is:

bombe

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But I can't explain it at all! Could you help me understand?

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

I've seen this clue in The Mirror.

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