Crossword Genius

That's quite a bit of fighting for a cross (6)

Ross

I believe the answer is:

thwart

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'cross' is the definition.
(I know this)

I can't explain the rest of the clue.

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(Other definitions for thwart that I've seen before include "Frustrate or foil" , "seat for oarsman" , "Hinder or prevent" , "check" , "Oppose successfully" .)

I've seen this clue in The Telegraph.
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