Source : Webster's Revised Unabridged Dictionary (1913)

Clamber \Clam"ber\, v. i. [imp. & p. p. {Clambered}; p. pr. &
   vb. n. {Clambering}.] [OE clambren, clameren, to heap
   together, climb; akin to Icel. klambra to clamp, G. klammern.
   Cf. {Clamp}, {Climb}.]
   To climb with difficulty, or with hands and feet; -- also
   used figuratively.

         The narrow street that clambered toward the mill.
                                                  --Tennyson.

Clamber \Clam"ber\, n.
   The act of clambering. --T. Moore.

Clamber \Clam"ber\, v. t.
   To ascend by climbing with difficulty.

         Clambering the walls to eye him.         --Shak.

Source : WordNet®

clamber
     n : an awkward climb; "reaching the crest was a real clamber"
     v : climb awkwardly, as if by scrambling [syn: {scramble}, {shin},
          {shinny}, {skin}, {struggle}, {sputter}]