Stem joint
I believe the answer is:
node
'stem joint' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for node that I've seen before include "Done to a small lump" , "Point of branching in a network" , "Knob or lump" , "Point in network where lines intersect or branch" , "Point of intersection" .)