White with age (5)
I believe the answer is:
hoary
'white with age' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hoary that I've seen before include "Grey-haired and old" , "Grizzled or frosted" , "Grizzly - ancient" , "Of joke, old and much-heard" , "Venerably grey" .)