Unclamp rhymes with:
clamp, clamp, lamp, lampe, lampp, amp, camp, champ, clamp, cramp, damp, decamp, encamp, gamp, hamp, hampe, kamp, kampe, kramp, krampe, lamp, lampe, lampp, ramp, revamp, samp, schamp, shamp, stamp, tamp, tramp, trampe, vamp, vancamp