The Collaborative International Dictionary of English v.0.48:

Clique \Clique\ (kl[=e]k), n. [F., fr. OF. cliquer to click. See
   Click, v. i.]
   A narrow circle of persons associated by common interests or
   for the accomplishment of a common purpose; -- generally used
   in a bad sense.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clique \Clique\, v. i.
   To To associate together in a clannish way; to act with
   others secretly to gain a desired end; to plot; -- used with
   together.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "clique":
   age group, associate with, assort with, band, battalion, bevy,
   body, brigade, bunch, cabal, cadre, camarilla, camp, cast, cell,
   charmed circle, chum, chum together, chum with, circle, clan,
   clique with, closed circle, club together, cohort, company,
   complement, consort with, contingent, corps, coterie, covey, crew,
   crowd, detachment, detail, division, elite, elite group, faction,
   fellowship, fleet, flock together, fraternize, gang, group,
   grouping, groupment, hang around with, hang out with,
   herd together, hobnob with, in-group, ingroup, inner circle, join,
   join in fellowship, junta, junto, keep company with, mingle with,
   mix with, mob, movement, out-group, outfit, pack, pal, pal up with,
   pal with, party, peer group, phalanx, platoon, posse, regiment,
   ring, run in couples, run with, salon, set, sort with, squad,
   stable, string, take up with, team, tie up with, tribe, troop,
   troupe, we-group, wing