Mixture of ham and icing, a state! (8)
I believe the answer is:
michigan
'a state' is the definition.
(I know that Michigan is American state)
'mixture of ham and icing' is the wordplay.
'mixture of' indicates anagramming the letters (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'ham' put after 'icing' is 'icingham'.
'icingham' anagrammed gives 'MICHIGAN'.
(Other definitions for michigan that I've seen before include "I'm aching to go to a Great Lake" , "US Great Lakes state" , "State of Detroit" , "US state and Great Lake" , "Lake by which Chicago stands" .)