Fan heard about hospital department (8)
I believe the answer is:
adherent
'fan' is the definition.
(I've seen this before)
'heard about hospital department' is the wordplay.
'about' indicates an anagram.
'hospital department' becomes 'ent' (Ear, Nose and Throat department).
'heard' with letters rearranged gives 'adher'.
'adher'+'ent'='ADHERENT'
(Other definitions for adherent that I've seen before include "One believes in and helps spread the doctrine of another" , "sticker" , "Person supporting" , "Dedicated supporter" , "Disciple, follower" .)