Source : Webster's Revised Unabridged Dictionary (1913)

Clumps \Clumps\, n.
   A game in which questions are asked for the purpose of
   enabling the questioners to discover a word or thing
   previously selected by two persons who answer the questions;
   -- so called because the players take sides in two ``clumps''
   or groups, the ``clump'' which guesses the word winning the
   game.