She left under a cloud (5)
I believe the answer is:
hazel
'she' is the definition.
'left under a cloud' is the wordplay.
'left' becomes 'l' (common abbreviation).
'under' is a charade indicator (letters next to each other).
'a cloud' becomes 'haze' (haze is a kind of cloud).
'l' put after 'haze' is 'HAZEL'.
(Other definitions for hazel that I've seen before include "Tree with catkins" , "Tree; girl's name" , "Filbert" , "Light brown; nut" , "Cob (nut)" .)