Approaches part of hospital, upset by tin organ (5,4)
I believe the answer is:
draws near
'approaches' is the definition.
('draw near' can be a synonym of 'approach')
'part of hospital upset by tin organ' is the wordplay.
'part of hospital' becomes 'ward' (hospitals have wards).
'upset' says the letters should be written in reverse.
'by' is a charade indicator (letters next to each other).
'tin' becomes 'Sn' (Sn is the chemical symbol for tin).
'organ' becomes 'ear' (the ear is an organ).
'ward' written backwards gives 'draw'.
'draw'+'sn'+'ear'='DRAWS NEAR'
(Other definitions for draws near that I've seen before include "Approaches" , "comes to" .)