The most common and most likely answer to this crossword clue is the 7 letter word DISUSED
I've seen this crossword clue in The Guardian
D
I
S
U
S
E
D
More clues leading to the result DISUSED
- Unemployed CID officers meeting American press chief
- Abandoned South American stopped ringing
- Put down round tube that’s empty
- Out of service, police officers took drugs
- Abandoned education after university in Norfolk town
- Olympic event not initially covered — journalist no longer working
- Stopped touring South America — not now of interest?
- Abandoned, sided with us to restore
- Neglected and treated with contempt outside university
- Idle suspicion is late for circulation
Buddy explains!

The straight part
We know that "Out of service" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case out of service = disused.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 DISUSED mean?
DISUSED verb- To cease the use of.
- To disaccustom.
- No longer in use.