Lure hospital department with diamonds (6)
I believe the answer is:
entice
'lure' is the definition.
(lure can mean to entice or attract)
'hospital department with diamonds' is the wordplay.
'hospital department' becomes 'ENT' (abbreviation for Ear, Nose and Throat department).
'with' means one lot of letters go next to another.
'diamonds' becomes 'ice' (slang term for diamonds).
'ent'+'ice'='ENTICE'
(Other definitions for entice that I've seen before include "Tempt with inducement" , "Attract (by pleasure)" , "how siren might operate?" , "Lure, inveigle" , "draw" .)