Crossword Genius

*Opposing maths war troubling cohort (7)

Ross

I believe the answer is:

athwart

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'opposing' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for athwart that I've seen before include "What rat is placed across?" , "Crosswise" , "Crossing" , "Transverse; at an oblique angle" , "wrongly" .)

I've seen this clue in the Sydney Morning Herald.
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