Eat with hospital worker who's a fan (9)
I believe the answer is:
supporter
'a fan' is the definition.
(eg a fan of a football team)
'eat with hospital worker' is the wordplay.
'eat' becomes 'sup' (supping is a kind of eating).
'with' means one lot of letters go next to another.
'hospital worker' becomes 'porter' (I've seen this before).
'sup'+'porter'='SUPPORTER'
'who's' is the link.
(Other definitions for supporter that I've seen before include "Adherent, defender" , "One helping" , "Strut" , "angel" , "Stay" .)