Roof part (4)
'roof part' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for eave that I've seen is " Roof edge".)
(Other definitions for gable that I've seen before include "Triangular part of a wall supporting a ridged roof" , "screen legend" , "Roof structure" , "Old actor" , "American film star, d. 1960" .)