Understand husband will give up son in plot (5)
I believe the answer is:
graph
'plot' is the definition.
(graphing is a kind of plotting)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for graph that I've seen before include "Visual representation" , "A plotted chart" , "Drawing showing relationship between quantities" , "Diagram showing the relation between variables" , "Mathematical diagram" .)