Atrium is changed for a desert (8)

I believe the answer is:

tiramisu

(Other definitions for tiramisu that I've seen before include "Greek dessert" , "Dessert -- is it arum? (anag)" , "Italian dessert with coffee and liqueur" , "for which damp sponge is needed" , "Italian sponge pudding" .)

I've seen this clue in The Irish Times.

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