One churchman or another missing company (4)
I believe the answer is:
dean
'one churchman' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for dean that I've seen before include "Kind of clergyman or university official" , "Ice dancer" , "school head" , "Glos. forest; Dixie ---, Everton hero" , "James ..., film actor" .)