Crossword Genius

Leading spinner’s ball, covered by dew, dismissing #1 (7)

Ross

I believe the answer is:

topmost

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'leading' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for topmost that I've seen before include "Supreme" , "Highest" .)

I've seen this clue in The Hindu.
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