The most common and most likely answer to this crossword clue is the 12 letter word ASTROCOMPASS
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More clues leading to the result ASTROCOMPASS
Buddy explains!
The straight part
We know that "Direction finder in the sky" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case direction finder in the sky = astrocompass.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 ASTROCOMPASS mean?
ASTROCOMPASS noun- A form of compass in which direction is evaluated by sighting stars of known position