Returned note about a girl, a reckless individual (7)
I believe the answer is:
hothead
'individual' is the definition.
(hothead is a kind of individual)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for hothead that I've seen before include "Quick-tempered person" , "maniac" , "Daredevil" , "Excitable person" , "An impetuous person with warm cranium" .)