Crossword Genius

Chemical partly unstable, a chloride (6)

Ross

I believe the answer is:

bleach

'chemical' is the definition.
(I've seen this before)

'partly unstable a chloride' is the wordplay.
'partly' indicates a hidden word (part of the clue is used).
'BLEACH' is hidden in the letters of 'unstable a chloride'.

(Other definitions for bleach that I've seen before include "Go white" , "Disinfectant and whitener" , "Blanche" , "Whiten with a belch" , "Make white by sun or chemicals" .)

I've seen this clue in The Sun.
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