Ardent fan (7)
I believe the answer is:
devotee
'ardent fan' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for devotee that I've seen before include "Zealous follower" , "Fan, enthusiast" , "Fanatic" , "Person who is utterly loyal and committed to someone" , "One strongly interested in something" .)