Well-used pencil, say (3)
I believe the answer is:
nub
(Other definitions for nub that I've seen before include "Crux; lump" , "Crux, central point" , "Metal piece" , "'Gist, central idea (3)'" , "Gist; small lump" .)
I believe the answer is:
nub
(Other definitions for nub that I've seen before include "Crux; lump" , "Crux, central point" , "Metal piece" , "'Gist, central idea (3)'" , "Gist; small lump" .)