Dessert: for a change, it’s a rum one (8)
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I believe the answer is:
tiramisu
'dessert' is the definition.
(I've seen this before)
'change it's a rum one' is the wordplay.
'change' indicates anagramming the letters.
'one' becomes 'i' (Roman numeral).
'its'+'a'+'rum'+'i'='itsarumi'
'itsarumi' with letters rearranged gives 'TIRAMISU'.
'for a' acts as a link.
(Other definitions for tiramisu that I've seen before include "I must air the Italian dessert" , "Italian dessert with coffee and liqueur" , "Rich dessert, it is a rum (anag.)" , "It. dessert, literally pick me up" , "Dessert soaked in alcohol" .)