Disc golf standard (3)
I believe the answer is:
par
'disc golf standard' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for par that I've seen before include "Norm" , "Normal number of strokes for a hole at golf" , "Accepted level" , "Rating of strokes required for hole (golf)" , "Average score for good golf player" .)