Crossword Genius

Knocked for six in defeat (8)

Ross

I believe the answer is:

overcome

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'defeat' is the definition.
(I know that overcome is a more specific form of beat)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for overcome that I've seen before include "Speechless" , "'Engulfed, by emotion say (8)'" , "Emotionally affected" , "hammer" , "Overwhelm (someone)" .)

I've seen this clue in The Independent.
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