Crossword Genius

Obscure (8)

Ross

'obscure' is the definition.
(synonyms)

This is all the clue.

(Other definitions for abstruse that I've seen before include "Hard to understand, complicated" , "Difficult to comprehend" , "Arcane" , "Strange busts are difficult to understand" , "Difficult to understand, obscure" .)

I've seen this clue in the Evening Standard and The Guardian.
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