The most common and most likely answer to this crossword clue is the 5 letter word ADIOS
A
D
I
O
S
More clues leading to the result ADIOS
- Trouble’s besetting one for so long
- See you in Ibiza having ace parties across island
- Trouble’s besetting one for so long in Spain
- A girl thus returning Miguel’s valediction
- Without love, a day is so long
- Pop over about one? I’m off!
- Spanish Cheers run dropped from broadcasts
- Farewell drink I accepted served up
- Top broadcasters for so long
- See you are demure interviewing odious Soviet leaders
Buddy explains!

The straight part
We know that "so long in Spain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case so long in spain = adios.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 ADIOS mean?
ADIOS interjection- (in Spanish contexts) goodbye