Reference mark's ragged edges changed around (6)
I believe the answer is:
dagger
'reference mark's' is the definition.
(thesaurus)
'ragged edges changed around' is the wordplay.
'ragged' can be anagrammed to 'DAGGER'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for dagger that I've seen before include "Hand weapon" , "'Short, double-edged blade (6)'" , "Short knife for stabbing" , "Murder weapon" , "Macbeth's weapon" .)