The word clothiers 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (21 words)
chortle, cithers, clothes, coheirs, colters, coltish, erotics, estriol, heroics, holiest, holster, hostile, hostler, loiters, ostrich, recoils, rhotics, richest, slither, toilers, torches