Kitchen device rotates for cooking (7)
I believe the answer is:
toaster
'kitchen device' is the definition.
(I've seen this before)
'rotates for cooking' is the wordplay.
'for cooking' indicates an anagram (letters prepared or cooked into a new form).
'rotates' with letters rearranged gives 'TOASTER'.
(Other definitions for toaster that I've seen before include "something in kitchen" , "DJ" , "Kitchen gadget" , "Man speaking up at table" , "Electrical kitchen appliance" .)