Sear or singe (6)
I believe the answer is:
scorch
I believe this is a double definition.
'sear' is the first definition.
(I know that sear can be written as scorch)
'singe' is the second definition.
(I know that singe can be written as scorch)
(Other definitions for scorch that I've seen before include "Superficial damage" , "career" , "Wither from exposure to heat" , "Move very fast" , "To make fast progress" .)