The most common and most likely answer to this crossword clue is the 5 letter word BANTU
B
A
N
T
U
More clues leading to the result BANTU
- Language family don’t allow, excessively outspoken
- Message opposing workers’ rights in African languages
- Language graduate not missing old university
- Language group current in Bhutan
- Insist on the formal “you” in French language?
- Foreign language graduate needs books on the capital of Uruguay
- Stop a couple talking a foreign language
- African six-footer stops drunk in Paris
- Bishop reportedly also comprehends a number of foreign languages
- Language of trade union after veto
Buddy explains!

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