Evangelist takes turn with person delivering letters (9)
I believe the answer is:
gospeller
'evangelist' is the definition.
(I know that evangelist can be written as gospeller)
'turn with person delivering letters' is the wordplay.
I cannot really see how this works, but
'turn' could be 'spell' (synonyms) and 'spell' is found in the answer.
'person' could be 'goer' (goer is a kind of person) and 'goer' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'takes' is the link.
Can you help me to learn more?
(Other definitions for gospeller that I've seen before include "evangelical preacher" , "zealous preacher" , "Bible reader" , "Evangelist" , "religious type" .)