There are several artists by this name
#1 Clandestine is a Progressive Rock/Metal band from Los Angeles, CA
#2 Clandestine is a Celtic music group from Houston, Texas
#3 Clandestine were a Melodic Death Metal from Swinoujscie, Poland
#4 Clandestine is a rock band from Belgium
#5 Clandestine is an alias of musician Arthur Russell

#2
Clandestine is a Celtic music group from Houston, Texas. Featuring bagpipes, guitar, fiddle, and drums (bodhrán and conga drums), they play traditional Celtic music (both instrumental and vocal) as well as some modern tunes (including some originals). Some songs include additional instruments like flute, bombarde and various whistles. They formed in 1991, stabilized as a quartet in 1996, and dissolved for a time in 2003. Original members included Emily Dugas, Jen Hamel, E.J. Jones, and Gregory McQueen. In their original incarnation, the band made 4 discs and toured heavily around the US and also performed in Europe. They were favorites at McGonigel's Mucky Duck Pub in their hometown of Houston, as well as the Cactus Cafe in nearby Austin. The band was reformed in 2006 with Al Cofrin (also of Istanpitta).

#3
Clandestine were a Melodic Death Metal band hailing from Swinoujscie, Poland. They were founded in 1993 and split up around 1996 (?). Clandestine released 4 full length demos (albums?): Demo '93, Clandestine (Demo 1994), Umarle Konie (Demo 1995), Samotny Jednoro¿ec (Demo, 1996).
http://metal-archives.com/band.php?id=17186

#4
Clandestine is a rock band from Belgium. Their first album, "Les Noces de Cupidon", was released in December 2008.
http://www.myspace.com/clandestinebe

#5
See: Arthur Russell. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.