The most common and most likely answer to this crossword clue is the 7 plus 5 letter word DAYTONA BEACH
I've seen this crossword clue in The Guardian
D
A
Y
T
O
N
A
B
E
A
C
H
More clues leading to the result DAYTONA BEACH
Buddy explains!

The straight part
We know that "US resort" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case us resort = daytona beach.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.