One of the Roosevelts confused one earl (7)
I believe the answer is:
eleanor
'one of the roosevelts' is the definition.
(Eleanor Roosevelt, wife of Theodore Roosevelt)
'confused one earl' is the wordplay.
'confused' indicates anagramming the letters.
'one'+'earl'='oneearl'
'oneearl' is an anagram of 'ELEANOR'.
(Other definitions for eleanor that I've seen before include "-- Bron, actress" , "Near Leo (anag) - girl's name" , "Edward the First's queen" , "Lady" , "Name used in Beatles song" .)