... partially mislead her enthusiastic follower (8)
I believe the answer is:
adherent
'follower' is the definition.
(adherent is a kind of follower)
'partially mislead her enthusiastic' is the wordplay.
'partially' indicates the answer is hidden within the clue.
'ADHERENT' is hidden within 'mislead her enthusiastic'.
(Other definitions for adherent that I've seen before include "supporter of party" , "One supports" , "Dedicated supporter" , "One supporting" , "Loyal follower - sticks close" .)