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 Sun, The Independent, the Evening Standard and the Sydney Morning Herald.

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