Crossword Genius

Opposing sides on Armstrong's cycling disgrace (7)

Ross

I believe the answer is:

against

'opposing' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for against that I've seen before include "In disagreement with" , "Abutting" , "Opposite to" , "close by" , "V" .)

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