Crossword Genius

A terrible overtaker! (7)

Ross

I believe the answer is:

nemesis

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for nemesis that I've seen before include "Greek goddess - opponent who cannot be beaten" , "causes downfall" , "Unbeatable rival" , "curse" , "rival who can't be beaten" .)

I've seen this clue in the Evening Standard.
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