Tear to pieces (3,2)
'tear to pieces' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for dismember that I've seen before include "Cut the limbs from" , "cut to pieces" , "Dissect" , "Remove the limbs of, or divide into parts" , "Break up" .)
(Another definition for rip up that I've seen is " Tear to shreds".)