Whitener (6)

I believe the answer is:

bleach

'whitener' is the definition.
(synonyms)

This is all the clue.

(Other definitions for bleach that I've seen before include "Household cleaner" , "Strong cleaner" , "Get lighter" , "Whitening agent" , "Chemical whitener" .)

I've seen this clue in the Evening Standard, The Sun, the Sydney Morning Herald and The Independent.

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