Soys used incorrectly by Greek hero? (8)
I believe the answer is:
odysseus
'greek hero?' is the definition.
(I've seen this before)
'soys used incorrectly' is the wordplay.
'incorrectly' indicates an anagram (I've seen this in other clues).
'soys'+'used'='soysused'
'soysused' anagrammed gives 'ODYSSEUS'.
'by' acts as a link.
(Other definitions for odysseus that I've seen before include "Classical traveller" , "Homer's wandering hero" , "Voyager" , "Homeric hero" , "King of Ithaca, who returned after the siege of Troy" .)