Horse always found around hospital department (7)
I believe the answer is:
eventer
'horse' is the definition.
(I have seen 'Equestrian horse ' mean 'eventer' so perhaps 'horse' could also mean 'eventer')
'always found around hospital department' is the wordplay.
'always' becomes 'ever' (synonyms).
'found around' is an insertion indicator.
'hospital department' becomes 'ENT' (abbreviation for Ear, Nose and Throat department).
'ever' placed around 'ent' is 'EVENTER'.
(Other definitions for eventer that I've seen before include "Showjumper" , "Jumper" , "Competitive rider" , "competitive horse" , "Competing horse or rider" .)