Withstood wind and rain, say (9)
I believe the answer is:
weathered
'withstood' is the definition.
(weathering is a kind of withstanding)
'wind and rain say' is the wordplay.
'wind' becomes 'ed' (I can't explain this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'rain say' becomes 'weather' (rain is a kind of weather).
'ed' put after 'weather' is 'WEATHERED'.
Can you help me to learn more?
(Other definitions for weathered that I've seen before include "Worn by wind and rain" , "Strengthened by being exposed to the elements" .)