Ring girl? You will, you confess finally (7)
I believe the answer is:
annulus
'ring' is the definition.
(technical term for ring-shaped object)
'girl? you will you confess finally' is the wordplay.
'girl?' becomes 'ann' (woman's name).
'finally' says to take the final letters.
The final letters of 'you will you confess' are 'ulus'.
'ann'+'ulus'='ANNULUS'
(Other definitions for annulus that I've seen before include "Ring-shaped object" , "Ring-shaped structure" .)