The most common and most likely answer to this crossword clue is the 11 letter word EQUIDISTANT
I've seen this crossword clue in The Times
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More clues leading to the result EQUIDISTANT
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The straight part
We know that "Just as far" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case just as far = equidistant.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does EQUIDISTANT mean?
EQUIDISTANT adjective- Occupying a position midway between two ends or sides.
- Occupying a position that is an equal distance between several points. Note that in a one-dimensional space this position can be identified with two points, in a two-dimensional space with three points (not on the same straight line), and in a three-dimensional space with four points (not in the same plane).
- Describing a map projection that preserves scale. No map can show scale correctly throughout the entire map but some can show true scale between one or two points and every point or along every meridian and these are referred to as equidistant.