The most common and most likely answer to this crossword clue is the 9 letter word ANDALUSIA
I've seen this crossword clue in The Guardian
A
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A
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A
More clues leading to the result ANDALUSIA
- Sundial fixed in two areas in Spanish region
- Area in Spain – and a large one in USA
- Asian lad travelling around posh part of Spain
- Asian lad worried about university in this part of Spain
- A sundial fixed by artisan initially in part of Spain
- Part of Spain joined with States, inter alia
- Article on a sundial designed in region of Spain
- Region that’s Spanish and American, inter alia
- An artist welcoming us to a region of Spain
- Spanish region, also a large one in the States
Buddy explains!

The straight part
We know that "Region that’s Spanish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case region that’s spanish = andalusia.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.