Handling matter differently on hospital department (9)
I believe the answer is:
treatment
'handling' is the definition.
('treatment' can be a synonym of 'handling')
'matter differently on hospital department' is the wordplay.
'differently' is an anagram indicator.
'on' says to put letters next to each other.
'hospital department' becomes 'ent'.
'matter' anagrammed gives 'treatm'.
'treatm'+'ent'='TREATMENT'
(Other definitions for treatment that I've seen before include "prescribed drugs possibly" , "Application of remedy" , "Medical care for injury" , "patient progress" , "Hospital care" .)