The most common and most likely answer to this crossword clue is the 9 letter word UKRAINIAN
I've seen this crossword clue in The Times
U
K
R
A
I
N
I
A
N
More clues leading to the result UKRAINIAN
- Wet British weather initially irritating an East European
- Former Soviet sulks off-and-on about Gulf republic head dropping two places
- British weather starts to irritate absurdly nervy Slav
- In this country, Iranian is disguised as East European
- National from this country, artist in Paisley?
- European nation has wet weather, man!
- Bad weather over Britain visits Scotsman and Slav
- Language from punk regularly pelting Scotsman?
- Country forced Iranian subject
Buddy explains!
The straight part
We know that "East European" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case east european = ukrainian.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.