Crossword Genius

So much longer! (9)

Ross

I believe the answer is:

therefore

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 therefore)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for therefore that I've seen before include "has a triangular formation in maths?" , "It follows" , "Thus" , "In consequence" , "Ergo" .)

I've seen this clue in the Evening Standard.
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