Crossword Genius

The horizon may be this, according to my understanding? (2,3,2,1,3,3)

Ross

I believe the answer is:

as far as i can see

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'according to my understanding?' is the definition.
(phrase meaning 'in my opinion' or 'it seems to me')

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

Can you help me to learn more?

(Other definitions for as far as i can see that I've seen before include "to my knowledge" , "The faintest star is" , "To the best of my understanding" .)

I've seen this clue in The Telegraph.
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