Clarification lead-in

This time we are looking on the crossword clue for: Clarification lead-in.
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Possible Answers: IDEST, IMEAN.

Last seen on: –Wall Street Journal Crossword – January 12 2023 – Opa!
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Random information on the term “IDEST”:

Space law encompasses national and international law governing activities in outer space. International lawyers have been unable to agree on a uniform definition of the term “outer space”, although most lawyers agree that outer space generally begins at the lowest altitude above sea level at which objects can orbit the Earth, approximately 100 km (62 mi) (the Kármán line).

The inception of the field of space law began with the launch of the world’s first artificial satellite by the Soviet Union in October 1957. Named Sputnik 1, the satellite was launched as part of the International Geophysical Year. Since that time, space law has evolved and assumed more importance as mankind has increasingly come to use and rely on space-based resources.

At Caltech in 1942 Theodore von Kármán and other rocket scientists banded together to form Aerojet rocket company with the help of lawyer Andrew G. Haley. To toast the new corporation, Kármán said, “Now, Andy, we will make the rockets – you must make the corporation and obtain the money. Later on you will have to see that we behave well in outer space…After all, we are the scientists but you are the lawyer, and you must tell us how to behave ourselves according to law and to safeguard our innocence.” Indeed, twenty years later Haley published the fundamental textbook, Space Law and Government.

IDEST on Wikipedia