Stones murderer, stifling resistance (5)
I believe the answer is:
cairn
'stones' is the definition.
(I've seen this before)
'murderer stifling resistance' is the wordplay.
'murderer' becomes 'cain' (Biblical figure).
'stifling' indicates putting letters inside (some letters get stifled or contained).
'resistance' becomes 'r' (electronics abbreviation).
'cain' enclosing 'r' is 'CAIRN'.
(Other definitions for cairn that I've seen before include "Memorial mound of stones" , "Terrier - mound of stones" , "simple grave marker" , "Man" , "Pile of stones - type of terrier" .)