Set fire to editing material (7)
I believe the answer is:
ignited
'set fire to' is the definition.
(I've seen this before)
'editing material' is the wordplay.
'material' indicates anagramming the letters (the letters provide the material for a new word).
'editing' with letters rearranged gives 'IGNITED'.
(Other definitions for ignited that I've seen before include "Lit" , "Set alight" , "Sparked off" , "fired" , "Kindled" .)