Highest score? Fine (3-5)
I believe the answer is:
top-notch
'fine' is the definition.
(I've seen this before)
'highest score?' is the wordplay.
'highest' becomes 'top' (at the top).
'score?' becomes 'notch' (scoring is a kind of notching).
'top'+'notch'='TOP-NOTCH'
(Other definitions for top-notch that I've seen before include "Superb" , "Excellent (informal)" , "Of the highest quality" , "Grade 1" , "Wonderful" .)