Crossword Genius

On the ball, sportingly, but it's still pretty low (4)

Ross

I believe the answer is:

base

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'low' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for base that I've seen before include "Mean; HQ" , "floor" , "Found - station - contemptible" , "This underlying structure" , "Ignoble; low part" .)

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