Crossword Genius

A little dust detectable during inspection (5)

Ross

I believe the answer is:

speck

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'a little' is the definition.
(thesaurus)

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(Other definitions for speck that I've seen before include "Small mark" , "Tiny spot" , "Dot" , "Italian ham" , "Bit of dust" .)

I've seen this clue in the Evening Standard.
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