Foreboding now I'm approaching hospital department (12)
I believe the answer is:
presentiment
'foreboding' is the definition.
(I know that foreboding can be written as presentiment)
'now i'm approaching hospital department' is the wordplay.
'now' becomes 'present' (the present time).
'approaching' is a charade indicator (letters next to each other).
'hospital department' becomes 'ENT' (abbreviation for Ear, Nose and Throat department).
'present'+'im'+'ent'='PRESENTIMENT'
(Other definitions for presentiment that I've seen before include "Feeling of apprehension" , "Intuitive foreboding" , "bad feeling" , "An intuitive feeling" .)