Crossword Genius

Still not very upset (5)

Ross

I believe the answer is:

inert

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

I cannot understand how the remainder of the clue works.

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(Other definitions for inert that I've seen before include "(Chem.) not reactive" , "Nothing doing" , "'Not moving, lifeless (5)'" , "Nitre (anag.)" , "Sluggish - unresponsive" .)

I've seen this clue in The Hindu.
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