A standard figure, of course (3)
I believe the answer is:
par
This could be a double definition.
'a standard' is the first definition.
(standard of play in golf)
'figure of course' is the second definition.
The answer and definition can be both quantities as well as being singular nouns.
I also know that 'course' relates to this answer.
Can you help me to learn more?
(Other definitions for par that I've seen before include "standard for course" , "Standard amount" , "level footing" , "Rating of strokes required for hole (golf)" , "Average - equality" .)