A revenue from energy came to light (5)
I believe the answer is:
arose
'came to light' is the definition.
(I've seen this in another clue)
'a revenue from energy' is the wordplay.
'revenue from energy' becomes 'rose' (I can't justify this - if you can you should believe this answer much more).
'a'+'rose'='AROSE'
Can you help me to learn more?
(Other definitions for arose that I've seen before include "Sprang up" , "appeared" , "Followed" , "Came about" , "stemmed" .)