The most common and most likely answer to this crossword clue is the 7 letter word LITURGY
I've seen this crossword clue in The Daily Telegraph
L
I
T
U
R
G
Y
More clues leading to the result LITURGY
- Before short drive with Yankee, books service
- Communion the very thing, trapped by disease supposedly
- Christian sacrament for Italian succumbing to undiagnosed illness
- Service — something dreaded about it
- Undetermined illness restricting Italian in service
- Service computers, etc, in grip of virus, perhaps
- To stop bug, computer department provides service
- Trial guy disrupted lacking a form of ritual
- Religious rite — the thing needed when there’s disease around
- Unspecified bug blocked by IT service
Buddy explains!

The straight part
We know that "service" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case service = liturgy.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 LITURGY mean?
LITURGY noun- A predetermined or prescribed set of rituals that are performed, usually by a religion.
- An official worship service of the Christian church.
- In Ancient Greece, a form of personal service to the state.