Criminal raised origin of murder weapon (7)
I believe the answer is:
sidearm
'weapon' is the definition.
(I've seen this before)
'criminal raised origin of murder' is the wordplay.
'criminal' is an anagram indicator.
'origin of' says to take the initial letters.
The first letter of 'murder' is 'm'.
'raised' anagrammed gives 'sidear'.
'sidear'+'m'='SIDEARM'
(Other definitions for sidearm that I've seen before include "Piece" , "Officer may carry this" , "weapon" , "One may be fired" .)