Powerful person suggests outstanding woman's to join circle (9)
I believe the answer is:
superhero
'powerful person' is the definition.
The definition suggests a singular noun which matches the answer.
'outstanding woman's to join circle' is the wordplay.
'outstanding' becomes 'super' (super can mean very good).
'woman's' becomes 'her' (belonging to a woman).
'to join' is a charade indicator (letters next to each other).
'circle' becomes 'O' (O is a circle).
'super'+'her'+'o'='SUPERHERO'
'suggests' is the link.
Can you help me to learn more?
(Other definitions for superhero that I've seen before include "people didn't notice in Kent, for one" , "Her poseur (anag.)" , "Fantastic character" , "Fictional character with special powers" , "Person saving" .)