Weather-resistant wood (4)
I believe the answer is:
teak
'weather-resistant wood' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for teak that I've seen before include "Heavy wood of a tall evergreen Asian tree" , "Take away with very hard wood" , "Hard durable wood" , "Indian hardwood" , "Hardwood tree" .)