The most common and most likely answer to this crossword clue is the 8 letter word PRINCELY
I've seen this crossword clue in Independent
P
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More clues leading to the result PRINCELY
Buddy explains!

The straight part
We know that "rector in church, coming in to work (8)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rector in church, coming in to work (8) = princely.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PRINCELY mean?
PRINCELY adjective- Relating to a prince; regal; royal.
- Befitting a prince; grand; lavish or opulent.
- In the manner of a royal prince's conduct.