Power leads exploded from fire, eradicating country town (6)
I believe the answer is:
effect
'power' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for effect that I've seen before include "Result; make happen" , "Bring about - result" , "Pocket pistol" , "Impression produced on spectator" , "Consequence, outcome" .)