Chart hurricane, enthralling legendary ruler (6)
I believe the answer is:
arthur
'legendary ruler' is the definition.
(King Arthur)
'chart hurricane enthralling' is the wordplay.
'enthralling' says the answer is hidden in the clue (gripping the letters).
'ARTHUR' is hidden within 'chart hurricane'.
(Other definitions for arthur that I've seen before include "Husband of Guinevere" , "Excalibur king" , "Greed" , "Sir --- Conan Doyle" , "See 25" .)