Vicar’s boy not feeling too good, apparently (6)
I believe the answer is:
parson
'vicar's' is the definition.
(both are members of the clergy)
I cannot understand how the remainder of the clue works.
(Other definitions for parson that I've seen before include "One with benefice" , "Rector; clergyman" , "A rector or vicar" , "man of the church" , "Minister of religion" .)