Crossword Genius

Much-used pencil (3)

Ross

I believe the answer is:

nub

'much-used pencil' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nub that I've seen before include "Crux (of a matter)" , "Crux, gist" , "Small lump - main point" , "Central point of bun" , "'Gist, central idea (3)'" .)

I've seen this clue in the LA Times.
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