The term 'SECRET WATCHER' is a combination of two words: 'SECRET' and 'WATCHER'. The word 'SECRET' refers to something that is kept hidden or not revealed, while the word 'WATCHER' refers to someone who observes or keeps an eye on something. The crossword solution for this term is 'SPY', which is a person who secretly collects information about another person or organization. A SPY typically works in SECRET and often uses disguises and other methods to remain undetected.