22 across
Last
slice
of
Arctic
roll
for
pud
(7)
Last slice of Arctic roll for pud (7)
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The definition is at the end of the clue.
How the clue works
Look at pud — that's your definition, a pudding or dessert. "Last slice of Arctic" gives you the final letter, C, and then roll gives you RUMBLE (a rolling, rumbling sound). Put them together and you've got C + RUMBLE.