Overhanging roof edges (5)
I believe the answer is:
'overhanging roof edges' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eaves that I've seen before include "Overhanging roof edges" , "Roof projection" , "Section of roof" , "what might constitute a hangover?" , "Part of a building's roof that overhangs the walls" .)