The Collaborative International Dictionary of English v.0.48:

Cleverness \Clev"er*ness\, n.
   The quality of being clever; skill; dexterity; adroitness.

   Syn: See Ingenuity.
        [1913 Webster]

WordNet (r) 3.0 (2006):

cleverness
    n 1: the power of creative imagination [syn: inventiveness,
         ingeniousness, ingenuity, cleverness]
    2: intelligence as manifested in being quick and witty [syn:
       brightness, cleverness, smartness]
    3: the property of being ingenious; "a plot of great ingenuity";
       "the cleverness of its design" [syn: ingenuity,
       ingeniousness, cleverness]

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "cleverness":
   Italian hand, ability, acuity, acuteness, address, adeptness,
   adroitness, airmanship, aptitude, aptness, art, artfulness,
   artifice, artisanship, artistry, astuteness, braininess, bravura,
   brightness, brilliance, cageyness, callidity, canniness,
   capability, capacity, clear thinking, command, competence, control,
   coordination, craft, craftiness, craftsmanship, cunning,
   cunningness, deftness, dexterity, dexterousness, dextrousness,
   diplomacy, docility, educability, efficiency, esprit, expertise,
   facetiousness, facility, fine Italian hand, finesse, flair,
   foxiness, funniness, gamesmanship, genius, giftedness, gifts,
   grace, grip, guile, handiness, horsemanship, humorousness,
   impressionability, ingeniousness, ingenuity, insidiousness,
   intelligence, inventiveness, jocoseness, jocularity, joking,
   joshing, keen-wittedness, keenness, know-how, malleability,
   marksmanship, mastership, mastery, mental alertness,
   mercurial mind, moldability, motivation, native cleverness,
   nimble mind, nimble-wittedness, nimbleness, nous, one-upmanship,
   plasticity, pleasantry, pliability, practical ability, proficiency,
   prowess, pungency, quick parts, quick thinking, quick wit,
   quick-wittedness, quickness, readiness, ready wit, receptivity,
   resource, resourcefulness, saltiness, satanic cunning,
   savoir-faire, savvy, seamanship, sharp-wittedness, sharpness,
   shiftiness, shrewdness, skill, skillfulness, slipperiness, slyness,
   smartness, smarts, sneakiness, sophistry, sprightly wit, stealth,
   stealthiness, style, subtilty, subtleness, subtlety, suppleness,
   susceptibility, tact, tactfulness, talent, teachability,
   teachableness, technical brilliance, technical mastery,
   technical skill, technique, timing, trainableness, trickiness,
   virtuosity, wariness, wiles, wiliness, willingness, wit, wittiness,
   wizardry, workmanship