Crossword Genius

Horizontal invention (5)

Ross

I believe the answer is:

lying

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This clue might be a double definition.

'horizontal' is the first definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

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

Can you help me to learn more?

(Other definitions for lying that I've seen before include "Deviating from truth" , "Anything but upright" , "Not being disturbed" , "Spread out" , "Duplicity" .)

I've seen this clue in The Independent.
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