Best score, excellent (3-5)
I believe the answer is:
top-notch
'excellent' is the definition.
(I've seen this before)
'best score' is the wordplay.
'best' becomes 'top' (top can mean the very best).
'score' becomes 'notch' (I've seen this in another clue).
'top'+'notch'='TOP-NOTCH'
(Other definitions for top-notch that I've seen before include "Grade 1" , "First-rate" , "Of the highest quality" , "Superb" , "Excellent (informal)" .)