Stupid advice to overworked crossword compiler? (8)

I believe the answer is:

clueless

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'stupid' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for clueless that I've seen before include "Knowing nothing" , "Lacking in ideas" , "Totally uninformed about what's going on" , "Stupid (unlike crosswords!)" , "Stupid - ignorant" .)

I've seen this clue in The Independent.

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