Crossword Genius

Bump on a log, say (3)

Ross

I believe the answer is:

nub

(Other definitions for nub that I've seen before include "Centre point or core of a matter" , "Gist (of a matter)" , "Central point or core of matter" , "Most essential part of an idea" , "Gist; small lump" .)

I've seen this clue in The New York Times.
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