The most common and most likely answer to this crossword clue is the 10 letter word MOONRAKERS
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Buddy explains!
The straight part
We know that "set in the West Country/set/in the West Country" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set in the west country/set/in the west country = moonrakers.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 MOONRAKERS mean?
MOONRAKERS noun- Someone from Wiltshire. (After a story in which some Wiltshire peasants, seeing the reflection of the moon in a shallow pool, tried to rake it out.)
- A small, light sail located high on a mast (above the skysail) and used for speed.