Long head of hair raises our charm (7)
I believe the answer is:
enamour
'charm' is the definition.
('enamour' can be a synonym of 'charm')
'long head of hair raises our' is the wordplay.
'long head of hair' becomes 'mane'.
'raises' says the letters should be written in reverse.
'mane' reversed gives 'enam'.
'enam'+'our'='ENAMOUR'
(Other definitions for enamour that I've seen before include "Charm, captivate" , "Inspire with love; charm" , "Fill with love" , "Enchant" , "Delight" .)