The most common and most likely answer to this crossword clue is the 5 letter word IBIZA
I
B
I
Z
A
More clues leading to the result IBIZA
- Island that's part of Fiji, bizarrely
- Spanish island business located in Iowa
- Informal business in Iowa or Mediterranean island
- One business area's last resort
- One with informal dealings going to a Mediterranean island
- It’s Boris’s idea Zambia actually is primarily an island
- Independent area hosting small business somewhere in the Balearics
- International business associated with a part of Spain
- Business area on one island resort
- One little business on a Mediterranean island
Buddy explains!

The straight part
We know that "Catalan-speaking territory" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case catalan-speaking territory = ibiza.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.