Wither (7)
(Other definitions for wilt that I've seen before include "(Of plant) become limp" , "Shrivel and collapse" , "Droop in the heat" , "Flag" , "fade" .)
'wither' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for shrivel that I've seen before include "Become shrunken and wrinkled" , "Wither from lack of water" , "Wrinkle and contract" , "Wither, shrink" , "Shrink as from cold" .)
'wither' is the definition.
(atrophying is a kind of withering)
This is the entire clue.
(Other definitions for atrophy that I've seen before include "Waste away (from disuse?)" , "Degenerate" , "Waste away as through lack of food" , "Become weak and die away through lack of use" , "Waste away, wither" .)