The word clambering is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 23
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (43 words)
aligner, ambling, angelic, balmier, beaming, bearing, blaming, blaring, bracing, brangle, cabling, caliber, calibre, calming, carbine, carmine, claimer, clamber, climber, clinger, gambler, geminal, glacier, glancer, gmelina, gracile, gremlin, grimace, lambing, learing, mangier, mangler, manlier, mineral, mingler, miracle, nimbler, realign, reaming, reclaim, reclang, reclimb, ribcage