Crossword Genius

This could be down or across! (11)

Ross

I believe the answer is:

preposition

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'be down or across' is the wordplay.
I cannot really see how this works, but
'be' could be 'sit' (sitting is a kind of being) and 'sit' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'could' acts as a link.

Can you help me to learn more?

(Other definitions for preposition that I've seen before include "One is in" , "Possibly in" , ""Before" or "after", say" , "Part of speech" , "Word like after or for (grammar)" .)

I've seen this clue in The Telegraph.
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