The most common and most likely answer to this crossword clue is the 5 letter word HINDI
I've seen this crossword clue in The Times
H
I
N
D
I
More clues leading to the result HINDI
- Language used by Magwitch in Dickens
- Language used by rajah in Didwana
- Language used in skirmish in Didwana?
- Lively row lacking any extreme language
- Some Spanish in different language
- Hot country short of a language
- Old Scottish farmworker, initially identifying Asian language
- Language of North India
- After forgetting English, Swiss girl adopts new language
- Language coming from noisy party after stripper’s act
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 = hindi.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.