Crossword Genius

Fighting side by side? (2,1,3)

Ross

I believe the answer is:

in a row

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for in a row that I've seen before include "running" , "Consecutively" , "Like all the pretty maids" , "Lined up" , "arguing?" .)

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