Wasp nest sites
I believe the answer is:
eaves
'wasp nest sites' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eaves that I've seen before include "Part of a building's roof that overhangs the walls" , "Roof projection" , "parts of housetops" , "Projecting edge of a roof" , "Overhang at edge of a roof" .)