Definition from Wiktionary, the free dictionary
en clair (not comparable)
- (of the transmission of a signal) in the clear; without any encryption
2014, Sean McMeekin, 7/1/2014: Countdown to War, page 201:
- As per Berchtold's instructions, Giesl stopped in the border town of Semlin and wired the news immediately, en clair, such that Tisza, in Budapest, learned of Serbia's rejection even before 7 PM.