One of the many shiny art panels at the back of the room is actually a clandestine two-way mirror (look carefully, the color is slightly different). Back in the day (perhaps now) it allowed managers to survey service and presentation, which are still impeccable.
-- Ike DeLorenzo, Five classics revisited, Boston Globe, 27-May-09
I was commanded by Paramount's publicists -- the Legion of Women With Clipboards -- to come alone to an advance, clandestine screening of "Star Trek" a couple of weeks ago.
-- Hank Stuever, The Trouble With Quibbles, Washington Post, 11-May-09
They can also stealthily enlist a computer into so-called botnets - computers that have been clandestinely networked to perform tasks without the knowledge of their owners and operators.
-- Scott Duke Harris, Internet security problems have an upside for Silicon Valley, Mercury News, 11-May-09
Clandestine is from Latin clandestīnus, probably a blend of clam-de, secretly and intestīnus, internal.