English poet is religious leader (4)
I believe the answer is:
pope
This clue is a double definition.
'english poet' is the first definition.
(I've seen this in another clue)
'is religious leader' is the second definition.
(I've seen this in another clue)
(Other definitions for pope that I've seen before include "man of great authority" , "St Peter was the first" , "Vatican leader" , "Vatican head" , "Catholic leader" .)