Crossword Genius

Leading score is excellent (3-5)

Ross

I believe the answer is:

top-notch

'excellent' is the definition.
(I've seen this before)

'leading score' is the subsidiary indication.
'leading' becomes 'top'.
'score' becomes 'notch' (I've seen this before**).
'top'+'notch'='topnotch'

'is' is the link.

(Other definitions for top-notch that I've seen before include "Superb" , "First-rate" , "Excellent (informal)" , "Grade 1" , "Of the highest quality" .)

I've seen this clue in The Telegraph.
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