Faulty 3 system as far as one can see? (7)
I believe the answer is:
horizon
'as far as one can see?' is the definition.
(most distant point)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for horizon that I've seen before include "As far as one can see" , "Earth/sky interface" , "Where earth meets sky" , "Where the sky appears to meet the earth" , "The line at which the sky and the earth appear to meet" .)