The most common and most likely answer to this crossword clue is the 5 letter word IRISH
I
R
I
S
H
More clues leading to the result IRISH
- National flag Hibernians originally used?
- One Murdoch hails originally from Dublin?
- Passion redolent of dark films number neglected
- Flag horribly at first, like Oscar Wilde?
- This diary is not, oddly, about people
- Tongue and part of eye itch at the bottom
- Horse following flag of country
- Language of girl initially harsh
- Bit of a looker, hot European
- Part of Mayfair is home for some Europeans
Buddy explains!

The straight part
We know that "Language" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case language = irish.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.