Score hits (3,3,6)

I believe the answer is:

the top twenty

I'm a little stuck... Click here to teach me more about this clue!

'hits' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'score' is the wordplay.
I cannot quite understand how this works, but
'score' could be 'twenty' (synonyms) and 'twenty' is found in the answer.
This explanation may well be incorrect...

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