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Task mostly incorporating second check for fingerprints? (4)

Ross

I believe the answer is:

dust

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'check for fingerprints?' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for dust that I've seen before include "Unwanted fine powder" , "Clean - dirt" , "Powdery matter" , "Powdery dirt in dry areas" , "Powdered matter" .)

I've seen this clue in The Times.
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