Tempt hospital department with diamonds (6)
I believe the answer is:
entice
'tempt' is the definition.
(I know that tempt can be written as entice)
'hospital department with diamonds' is the wordplay.
'hospital department' becomes 'ENT' (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 "Attract, tempt" , "Persuade with nice offer" , "Attract with offers" , "Tempt with promises of reward" , "Attract or persuade with offer" .)