"Argonautica" character (5)
I believe the answer is:
medea
'argonautica character' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for medea that I've seen before include "Tragic heroine" , "Jason's spouse" , "Mythical wife who helped Jason get the Golden Fleece" , "Mrs Jason" , "Jason's wife who murdered their children" .)