Mythical creatures, possibly Etruscan (8)
I believe the answer is:
centaurs
'mythical creatures' is the definition.
(centaur is a kind of mythical creature)
'possibly etruscan' is the wordplay.
'possibly' indicates an anagram.
'etruscan' anagrammed gives 'CENTAURS'.
(Other definitions for centaurs that I've seen before include "Man-horses?" , "Fabulous beasts of Etruscan origin" , "Tan curse on the mythical creatures" , "'Mythical creatures, half-man, half-horse (8)'" , "Mythical creatures, half man and half horse" .)