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' shows that the letters should be reversed in order.
'after' means one lot of letters go next to another.
'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' in reverse letter order is 'arb'.
'tour' with its first letter removed 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" .)