Crossword Genius

Soldier in jail atmosphere involved in dire extremes (9)

Ross

I believe the answer is:

brigadier

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'soldier' is the definition.

I can't explain the remainder of the clue.

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(Other definitions for brigadier that I've seen before include "Officer in charge of army unit, part of division" , "Rank above colonel" , "Army rank" , "High-ranking army officer" , "Air bridge over to the military officer" .)

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