Curl or hair (7)
I believe the answer is:
ringlet
I believe this clue is a double definition.
'curl' is the first definition.
(I know that curl can be written as ringlet)
'hair' is the second definition.
(I know that ringlet is a type of hair)
(Other definitions for ringlet that I've seen before include "twist of sorts?" , "A curl - kind of tingler" , "Curl of hair; butterfly" , "Hair curl, of an Irish dancer perhaps" , "Hair feature" .)