Crossword Genius

So the bus is empty? (4)

Ross

I believe the answer is:

thus

I'm a little stuck... Click here to teach me more about this clue!

'so' is the definition.
(I know that so can be written as thus)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for thus that I've seen before include "'So, therefore (4)'" , "as indicated" , "Therefore, hence" , "Like so" , "an original Christmas gift" .)

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