Lights that fused singe it (7)
I believe the answer is:
ignites
'lights' is the definition.
(I've seen this in another clue)
'fused singe it' is the wordplay.
'singe it' can be anagrammed to 'IGNITES'.
But, I am not clear how this is indicated.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for ignites that I've seen before include "Catches fire" , "Sets on fire" , "Sets alight" , "lights" .)