What bleach will do when it is brought in (6)
I believe the answer is:
whiten
'what bleach will do' is the definition.
The definition suggests a singular noun but the answer is not.
'when it is brought in' is the wordplay.
'is brought in' is an insertion indicator.
'when' going around 'it' is 'WHITEN'.
Can you help me to learn more?
(Other definitions for whiten that I've seen before include "Blanch" , "free from guilt" , "Turn pale" , "Bleach" , "Become less colourful" .)