Of durable wood (5)
I believe the answer is:
oaken
'of durable wood' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oaken that I've seen before include "like some old cabinets" , "of one wood" , "(Old adjective for something) made of a deciduous tree's wood" , "Timber" , "Made of wood from a deciduous tree" .)