Misrate erroneously as a goddess (7)
I believe the answer is:
artemis
'a goddess' is the definition.
(thesaurus)
'misrate erroneously' is the wordplay.
'erroneously' indicates anagramming the letters.
'misrate' with letters rearranged gives 'ARTEMIS'.
'as' is the link.
(Other definitions for artemis that I've seen before include "Huntress daughter of Zeus" , "God" , "Mythical Greek huntress" , "Virgin" , "Greek goddess of the hunt" .)