The most common and most likely answer to this crossword clue is the 3 plus 4 plus 3 plus 5 letter word GOD SAVE OUR QUEEN
G
O
D
S
A
V
E
O
U
R
Q
U
E
E
N
Buddy explains!
The straight part
We know that "This country air" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this country air = god save our queen.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.