Knowing nothing, such a crossword can't be solved? (8)

I believe the answer is:

clueless

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'knowing nothing' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for clueless that I've seen before include "unlike this puzzle!" , "Without any understanding" , "sort of crossword that nobody can solve?" , "Stupid - ignorant" , "Ignorant (informal)" .)

I've seen this clue in The Guardian and The Telegraph.

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