Letters from somebody else wouldn't upset church leader (6)
I believe the answer is:
wesley
'church leader' is the definition.
'Wesley' can be an answer for 'leader' (Wesley is an example). I'm unsure of the 'church' bit.
'letters from somebody else wouldn't upset' is the wordplay.
'letters from' indicates the answer is hidden within the clue (a selection of letters from the clue).
'upset' shows that the letters should be reversed in order.
'yelsew' is hidden in the letters of 'somebody else wouldnt'.
'yelsew' backwards is 'WESLEY'.
Can you help me to learn more?
(Other definitions for wesley that I've seen before include "John, C eighteen Methodism founder" , "English Methodist" , "church founder" , "Founder of Methodism, d. 1891" , "Methodist founder" .)