The Practice of Spying or of Using Spies
This page is the CodyCross answer for the clue below from Welcome to Japan, Group 563, Puzzle 3 (Observatories).
Question is: The Practice of Spying or of Using Spies
and the answer is: ESPIONAGE
Word Meaning:
ESPIONAGE — The act or process of learning secret information through clandestine means.
Definitions from Wiktionary.