Crossword Genius

Where American casualties may be tense still (5)

Ross

I believe the answer is:

inert

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'still' is the definition.
(not moving)

I don't understand how the remainder of the clue works.

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(Other definitions for inert that I've seen before include "Incapable of acting, like some gas" , "Nitre (anag.)" , "(Chem.) not reactive" , "dead" , "Torpid" .)

I've seen this clue in The Guardian.
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