The most common and most likely answer to this crossword clue is the 4 letter word URDU
I've seen this crossword clue in The Times
U
R
D
U
More clues leading to the result URDU
- Language that's somewhat absurd, unfortunately
- Tongue in ancient city to be enough for listeners
- Language used by neighbour dubious
- Language read externally in more than one university
- Somewhat absurd, using this language
- Go off melon, maybe, unpleasant at first for the tongue
- Language spoken at that cockney woman’s party?
- Tongue‘s fur due for scraping
- Some off-colour, dull khaki comes from here
- Tongue bends double, finding way in
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 = urdu.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.