Norm, standard (3)
I believe the answer is:
par
I believe this clue is a double definition.
'norm' is the first definition.
(I've seen this in another clue)
'standard' is the second definition.
(standard of play in golf)
(Other definitions for par that I've seen before include "Target score (golf)" , "Normal level or standard" , "Median" , "Standard score for golfers" , "Rap to get even" .)