Working with much smaller stuff than a note-checker covers (8)
I believe the answer is:
nanotech
'working with much smaller stuff' is the definition.
(technology dealing with tiny dimensions)
'than a note-checker covers' is the wordplay.
'covers' indicates the answer is hidden within the clue (I've seen 'covered' mean this (the answer is covered up by the clue)).
'NANOTECH' is hidden in the letters of 'than a note checker'.
(Another definition for nanotech that I've seen is " Very little science".)
I've seen this clue in The Times.
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