Opening is delight (8)
I believe the answer is:
entrance
I believe this is a double definition.
'opening' is the first definition.
(opening leading to a building)
'is delight' is the second definition.
(I've seen this in another clue)
(Other definitions for entrance that I've seen before include "Send" , "Opening to allow access" , "Means or place of going in" , "doorway" , "Maybe drive" .)