Unload bleach? (7)
I believe the answer is:
lighten
This clue is a double definition.
'unload' is the first definition.
(thesaurus)
'bleach?' is the second definition.
(thesaurus)
(Other definitions for lighten that I've seen before include "Make paler" , "Make less dark or heavy" , "Become less serious" , "Make less burdensome" , "Get blonde" .)