Girl, ten, straightened out curl (7)
I believe the answer is:
ringlet
'curl' is the definition.
(I know that curl can be written as ringlet)
'girl ten straightened out' is the wordplay.
'girl ten' anagrams to 'RINGLET'.
Though, I am not clear how this is indicated.
Can you help me to learn more?
(Other definitions for ringlet that I've seen before include "sort of lock" , "Curl or tendril" , "Long curl of hair" , "Hair feature" , "A curl - kind of tingler" .)