Rotates form of appliance (7)
I believe the answer is:
toaster
'appliance' is the definition.
(toaster is a kind of appliance)
'rotates form' is the wordplay.
'form' indicates an anagram (another form of the letters).
'rotates' anagrammed gives 'TOASTER'.
'of' is the link.
(Other definitions for toaster that I've seen before include "Bread griller" , "One raising glass" , "In the morning, this device used" , "Kitchen device" , "Machine for making brown bread?" .)