Shocked seeing space in hospital department (5)
I believe the answer is:
agape
'shocked' is the definition.
(thesaurus)
'space in hospital department' is the wordplay.
'space' becomes 'gap' (gap is a kind of space).
'in' means one lot of letters goes inside another.
'hospital department' becomes 'ae' (A and E, Accident and Emergency department).
'gap' going within 'ae' is 'AGAPE'.
'seeing' acts as a link.
(Other definitions for agape that I've seen before include "the love of God!" , "ecclesiastical feast" , "Christian feast" , "love a Christian shows" , "religious feast" .)