Scorecard standard (3)
I believe the answer is:
par
'scorecard 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 "Normal number of strokes for a hole at golf" , "Accepted standard" , "Average score for good golf player" , "Accepted level" , "Standard score for golfers" .)