The most common and most likely answer to this crossword clue is the 9 letter word HILLBILLY
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Buddy explains!
The straight part
We know that "Rustic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rustic = hillbilly.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 HILLBILLY mean?
HILLBILLY noun- Someone who is from the hills; especially from a rural area, with a connotation of a lack of refinement or sophistication.
- A white person from the rural southern part of the United States, especially the Southeastern states.
- To emphasize one's rural or humble upbringing; to use unsophisticated charm.
- To portray or act as an uneducated and unsophisticated fool.
- To perform or experience stereotypically hillbilly-like actions.