The most common and most likely answer to this crossword clue is the 6 letter word BRETON
I've seen this crossword clue in The Times
B
R
E
T
O
N
More clues leading to the result BRETON
- Language that's bent or contorted
- Bitter row, initially, over British school for Frenchman
- British school language
- French person’s back at the races, perhaps, taking in run
- French person connects fibre to network
- Brother returned short letter to person from Brest
- Continue gambling? That’s about right for Norman’s neighbour
- French person in British school
- Brother returned short letter to someone from Brest?
- Language rarely heard in British school
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 = breton.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.