The most common and most likely answer to this crossword clue is the 7 letter word VESPERS
I've seen this crossword clue in The Daily Telegraph
V
E
S
P
E
R
S
More clues leading to the result VESPERS
- Service vehicles from Italy, it’s said
- Service involves persuasion to some extent
- Inappropriate verses priest originally used for evening prayer
- Partly improves personal service
- Odd verses, beginning of prayer included, in evensong
- Approves personality offering service
- Poetical evenings with ghastly verse
- Within limits, gives personal service
- Criminal serves sandwiches quietly for evening gathering at church
Buddy explains!

The straight part
We know that "evensong" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case evensong = vespers.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 VESPERS mean?
VESPERS noun- The bell that summons worshipers to vespers; the vesper-bell
- The evening.
- A vesper martini.
- The sixth of the seven canonical hours