Sets fire to (7)
'sets fire to' is the definition.
This is all the clue.
(Other definitions for lights that I've seen before include "with something for the cat" , "Illuminators; lungs" , "SECOND PART OF 13" , "Illuminations or entrails" , "See 11" .)
(Other definitions for torches that I've seen before include "Flashlights" , "Fires" , "Portable lights or lamps" , "Hand-held lights" , "Sets alight" .)
'sets fire to' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ignites that I've seen before include "Sets on fire" , "Catches fire" , "lights" , "Sets alight" .)