Finishes ringing European pioneer of birth control (6)
I believe the answer is:
stopes
This might be a double definition.
'finishes ringing european' is the first definition.
The definition and answer can be both related to change as well as being verbs in their -s form.
Maybe there's a link between them I don't understand?
'pioneer of birth control' is the second definition.
(Marie Stopes)
Can you help me to learn more?
(Other definitions for stopes that I've seen before include "Birth control advocate" , "digs" , "Notoriety" , "Female campaigner" .)