"The Addams Family" character who speaks using seemingly unintelligible sounds (5)
I believe the answer is:
lurch
(Other definitions for lurch that I've seen before include "in which the abandoned may be left" , "Move abruptly to one side" , "Abrupt uncontrolled movement - something not to be left in?" , "Walk with unsteady swaying movements" , "Sudden unsteady movement" .)