She has one real potential (7)
I believe the answer is:
eleanor
'she' is the definition.
'one real potential' is the wordplay.
'potential' is an anagram indicator (another potential order of the letters).
'one'+'real'='onereal'
'onereal' is an anagram of 'ELEANOR'.
'has' is the link.
(Other definitions for eleanor that I've seen before include "A reel by Ringo (anag) -- Beatles song" , "- - Rigby: Beatles song" , "Queen from Aquitaine" , "Franklin D. Roosevelt's wife" , "Real one (anag) - girl's name" .)