Susan's bowled over by the legendary hero (7)
I believe the answer is:
theseus
'legendary hero' is the definition.
'susan's bowled over by the' is the wordplay.
'susan's' becomes 'sues' (I've seen this in other clues).
'bowled over' shows that the letters should be reversed in order.
'by' is a charade indicator (letters next to each other).
'sues' backwards is 'seus'.
'seus' after 'the' is 'THESEUS'.
(Other definitions for theseus that I've seen before include "Heroic figure" , "Mythological hero" , "Minotaur killer" , "Mythical hero" , "Occasion when public may visit (eg, school)" .)