The most common and most likely answer to this crossword clue is the 11 letter word COUNTRIFIED
I've seen this crossword clue in The Times
C
O
U
N
T
R
I
F
I
E
D
More clues leading to the result COUNTRIFIED
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 = countrified.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 COUNTRIFIED mean?
COUNTRIFIED adjective- Rural, rustic; unsophisticated.
- To make rural or rustic.