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Dreams
of
cool
relaxing
siestas
(10)
Dreams of cool relaxing siestas (10)
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The definition is at the beginning of the clue.
How the clue works
Here, Dreams is the definition (imagines pleasant things), with "of" just linking it to the wordplay. Start with FAN for "cool", then take an anagram of SIESTAS, with "relaxing" signalling the shuffle, to get TASISES. Stick the two together and you've got the full answer.