Good score in comparison (3)
I believe the answer is:
par
'good score' is the definition.
(I've seen this before)
'in comparison' is the wordplay.
'in' indicates the answer is hidden within the clue.
'PAR' is hidden in the letters of 'comparison'.
(Other definitions for par that I've seen before include "Normal level or standard" , "Regular score" , "Average - equality" , "Expected number of strokes for hole (golf)" , "standard for course" .)