This sort of clandestine use of radio has apparently been going on for as long as there's been shortwave, and the likeliest explanation is, as I said, that these broadcasts are a means that governments have of talking to their spies abroad. (slaw.ca)
However, unscrupulous sites still exist that lure you with a free auto insurance quote, but work in clandestine charges in some way. (carinsurancerates.com)
Along the way, he has a series of clandestine meetings with a nervous violinist (Tosar), an enigmatic blonde (Swinton), a naked seductress (de la Huerta), a British guitarist (Hurt), an edgy Mexican (Garcia Bernal), a silent driver (Abbas) and an arrogant American (Murray). (contactmusic.net)