Crossword Genius

Faintly visible numerals (3)

Ross

I believe the answer is:

dim

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for dim that I've seen before include "Without much light" , "Vague" , "Lacking in light" , "Not brilliant" , "Slow to learn" .)

I've seen this clue in the Evening Standard.
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