From Middle English clambren, clameren, clemeren, then either:
possibly from clam, clamb, clemb, past tense of climben, and influenced by Old English clæmman; or
from Old English *clambrian, from Proto-Germanic *klambrōną or *klambizōną.
The English word is cognate with Low German klemmern, klempern, Scots clammer; and compare also Danish klamre, Icelandic klambra, klembra, Swedish klamra.
The noun is derived from the verb.
Modern English dictionary
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