The most common and most likely answer to this crossword clue is the 9 letter word COMMUNION
I've seen this crossword clue in Independent
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More clues leading to the result COMMUNION
Buddy explains!

The straight part
We know that "Part of service" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of service = communion.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 COMMUNION mean?
COMMUNION noun- A joining together of minds or spirits.
- Holy Communion
- A form of ecclesiastical unity between the Roman Church and another, so that the latter is considered part of the former.