Crossword Genius

Not brilliant at figures (3)

Ross

I believe the answer is:

dim

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'not brilliant' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for dim that I've seen before include "Opaque, not bright" , "Not bright, cloudy" , "thick" , "Unpromising" , "Indistinct, dark" .)

I've seen this clue in the Evening Standard.
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