Crossword Genius

It may be upper or lower (4)

Ross

I believe the answer is:

case

'it may be upper or lower' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for case that I've seen before include "Police investigation" , "Trunk" , "Keep careful watch on" , "See 12" , "Box or outer covering" .)

I've seen this clue in The New York Times.
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