Tell of churchman losing head (6)
I believe the answer is:
relate
'tell' is the definition.
(relating is a kind of telling)
'churchman losing head' is the wordplay.
'churchman' becomes 'prelate' (I've seen this before).
'losing head' means to remove the first letter.
'prelate' with its first letter removed is 'RELATE'.
'of' is the link.
(Other definitions for relate that I've seen before include "Tell in Tralee" , "Tell; connect" , "Marriage Guidance - report" , "Narrate, tell in detail" , "Connect in Tralee" .)