Wither (7)
(Other definitions for fade that I've seen before include "Yellow" , "Grow dimmer" , "Wither away" , "Dwindle" , "Grow fainter" .)
(Other definitions for wilt that I've seen before include "tire?" , "Lose strength and become limp" , "Droop, wither" , "(Of plant) become limp" , "fade" .)
'wither' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for shrivel that I've seen before include "Become dry and withered" , "Become shrunken and wrinkled" , "Wither with loss of moisture" , "Desiccate" , "Wither, shrink" .)
'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 "Decay" , "Waste away - sounds like a sporting award" , "wasting away" , "Waste away as through lack of food" , "Become weak and die away through lack of use" .)