Wilt, shrivel (6)
I believe the answer is:
wither
This clue is a double definition.
'wilt' is the first definition.
(thesaurus)
'shrivel' is the second definition.
(I know that shrivel can be written as wither)
(Other definitions for wither that I've seen before include "decline" , "Waste" , "Fade" , "Dry up, become shrivelled" , "Writhe (anag.)" .)