The most common and most likely answer to this crossword clue is the 7 letter word SWAHILI
S
W
A
H
I
L
I
More clues leading to the result SWAHILI
- Language provoked by a limited rise in Westminster?
- A wish to cook up most of cheek and tongue
- Language — almost all I wish to be translated
- Language and humour is lacking initially in Westminster area
- Current rules reversed about greeting that's heard in Kenya
- Language's current rules about welcoming greeting
- In central Asia, keen about hard language
- Tongue rolling up berries, then I lick half off
- His law I translated into a foreign language
- Hailstorm in Belgravia area heard in parts of Africa
Buddy explains!

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