Crossword Genius

Difficult to understand (4)

Ross

I think it could be either:

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4

5,2,3

clear as mud

(Other definitions for clear as mud that I've seen before include "Completely unintelligible" , "Obscure" , "Taut condition" , "Not at all obvious" , "hard to fathom" .)

I've seen this clue in The Washington Post.
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