Clerical detective, relative to bishop, worn out (6,5)
I believe the answer is:
father brown
'clerical detective' is the definition.
'father brown' can be an answer for 'detective' (I've seen this before). I am not sure about the 'clerical' bit.
'relative to bishop worn out' is the wordplay.
'relative' becomes 'father' (father is a kind of relative).
'to bishop' becomes 'b' (abbreviation used in chess).
'out' indicates an anagram (out can mean wrong or inaccurate).
'worn' anagrammed gives 'rown'.
'father'+'b'+'rown'='FATHER BROWN'
Can you help me to learn more?
(Other definitions for father brown that I've seen before include "G.K. Chesterton's detective character" , "famous solver" , "Chesterton character" , "10 [SLEUTH]" .)