Nurse's undergarment turned up after hospital tour, but no top (7)
I believe the answer is:
harbour
'nurse's' is the definition.
(I've seen this before)
'undergarment turned up after hospital tour but no top' is the wordplay.
'undergarment' becomes 'bra' (bra is a kind of undergarment).
'turned up' says the letters should be written backwards.
'after' says to put letters next to each other.
'hospital' becomes 'H' (abbreviation for hospital on maps).
'but no top' means to remove the first letter (the letter at the top is removed).
'bra' backwards is 'arb'.
'tour' with its first letter taken away is 'our'.
'arb' after 'h' is 'harb'.
'harb'+'our'='HARBOUR'
(Other definitions for harbour that I've seen before include "Secretly maintain - port" , "Dock" , "Protected mooring" , "Shelter for shipping" , "Place of refuge" .)