Hollow in a hillside and Dublin maternity hospital (6)
I believe the answer is:
coombe
'hollow in a hillside and dublin maternity hospital' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for coombe that I've seen before include "Area of Dublin, with maternity hospital" , "Hollow in a hillside and Dublin maternity hospital" , "Bo, come to this area of Dublin" , "Short deep valley" .)