A crime spun by a superpower (7)
I believe the answer is:
america
'superpower' is the definition.
(I have seen 'The superpower' mean 'america' so perhaps 'superpower' could also mean 'america')
'a crime spun by a' is the wordplay.
'spun' indicates anagramming the letters.
'by' says to put letters next to each other.
'crime' with letters rearranged gives 'meric'.
'a'+'meric'+'a'='AMERICA'
(Other definitions for america that I've seen before include "United States" , "Camera I turn on the continent" , "Ira came from the continent" , "The USA" , "country targeted by 3 [ROMNEY]" .)