Sets fire to lands (6)
I believe the answer is:
lights
I believe this is a double definition.
'sets fire to' is the first definition.
'lands' is the second definition.
(lighting is a kind of landing)
(Other definitions for lights that I've seen before include "Illuminators; lungs" , "Illuminations or entrails" , "Lungs of sheep, pigs etc used as food" , "Ignites or illuminates" , "Chances" .)