Lime-based paint (9)

I believe the answer is:

whitewash

(Other definitions for whitewash that I've seen before include "Cover up - wall coating" , "Gloss over faults with wall colouring?" , "Attempt to conceal bad news" , "Deliberate cover-up of faults" , "Gloss over mistakes or faults, using wall or celing paint? (9)" .)

I've seen this clue in The Times.

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