Average, norm (3)
I believe the answer is:
par
I believe this is a double definition.
'average' is the first definition.
(average score in golf)
'norm' is the second definition.
(I've seen this in another clue)
(Other definitions for par that I've seen before include "Normal number of strokes for a hole at golf" , "Rating of strokes required for hole (golf)" , "Standard number of strokes for a golf hole" , "level footing" , "Average or normal score" .)