
1) Dealing in espionage 2) Like the spy biz 3) Like undercover operations 4) Melodramatic espionage 5) Secretive
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https://www.crosswordclues.com/clue/cloak-and-dagger
[radio] The original Football World Championship Train from 1954 at Altenbeken railway station, Germany, for the 2007 Vivat Viadukt celebrations. On the first weekend in July of odd-numbered years, Altenbeken celebrates its railway heritage with this festival of transportation. ...
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http://en.wikipedia.org/wiki/Cloak_and_Dagger_(radio)

`Cloak and dagger` is an English term sometimes used to refer to situations involving intrigue, secrecy, espionage, or mystery. The phrase has two possible origins. One dates from the early 19th century, and is a translation from the French de cape et d`épée and Spanish de capa y espada (literally `of cloak and sword`). These phrases referr...
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http://en.wikipedia.org/wiki/Cloak_and_dagger

Cloak-and-dagger is slang for relating to espionage.
Found on
http://www.probertencyclopaedia.com/browse/ZC.HTM

pertaining to, characteristic of, or dealing in espionage or intrigue, esp. of a romantic or dramatic kind.
Found on
https://www.infoplease.com/dictionary/cloak-and-dagger
No exact match found.