Heat to near boiling (5)
I believe the answer is:
scald
'heat to near boiling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scald that I've seen before include "Hurt with hot water" , "Burn with hot liquid" , "Heat (milk) to near boiling point" , "Burn with water" , "Injure with hot liquid" .)