Line in what actress responds to indicates heroic figure (8)
I believe the answer is:
hercules
'heroic figure' is the definition.
(mythical hero)
I can't explain the remainder of the clue.
(Other definitions for hercules that I've seen before include "Mythical strongman celebrated for his "labours"" , "Hero of Greek myth who performed 12 great labours" , "Greek hero who performed twelve great tasks" , "Mighty hero of Greek mythology" , "Strong hero" .)