The most common and most likely answer to this crossword clue is the 7 letter word GALILEO
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O
More clues leading to the result GALILEO
- Miss sign probed by one scientist
- Girl with one sign for scientist
- Stargazer's delay over current constellation
- Old scientist from Middle Eastern lake, briefly over
- Scientist one found in ship after docking
- Italy’s star man left goalie floundering
- Miss one constellation as astronomer with primitive telescope
- An astronomer, I stay behind, looking up over constellation
- Ship leaving the north carrying one scientist
- Inquisition victim, young woman associated with international sign
Buddy explains!

The straight part
We know that "scientist" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scientist = galileo.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.