Energetic person keeps a short time for evangelist (9)
I believe the answer is:
gospeller
'for evangelist' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for gospeller that I've seen before include "Evangelist" , "Bible reader" , "zealous preacher" , "evangelical preacher" , "religious type" .)