Fan of Slough confined by a physician! (7)
I believe the answer is:
admirer
'fan' is the definition.
(an admirer is a fan of something)
'slough confined by a physician' is the wordplay.
'slough' becomes 'mire' (I've seen this in another clue).
'confined by' indicates putting letters inside.
'physician' becomes 'Dr' (synonyms).
'a'+'dr'='adr'
'mire' placed within 'adr' is 'ADMIRER'.
'of' acts as a link.
(Other definitions for admirer that I've seen before include "potential suitor" , "Married (anag) -- lover" , "sweetheart" , "Person who fancies another" , "One who thinks highly or romantically of" .)