Crossword Genius

Obscure Roman numerals (3)

Ross

I believe the answer is:

dim

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dim that I've seen before include "Darken" , "Not bright, poorly lit" , "Without much light" , "Vague" , "out of mind?" .)

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