I'm a match for Satan? (7)
I believe the answer is:
lucifer
'satan?' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for lucifer that I've seen before include "the adversary" , "Rebellious angel; a match" , "Light" , "leader of rebellion" , "Satan, the Dark Angel" .)