The most common and most likely answer to this crossword clue is the 8 letter word POLYGLOT
I've seen this crossword clue in Financial Times
P
O
L
Y
G
L
O
T
More clues leading to the result POLYGLOT
- Multi-lingual parrot reportedly acquired outside Lima
- One who is able to talk in tongues?
- Cover off Floyd LP got translated in many languages
- Linguist said parrot had good luck
- Old college set to enrol Germany’s foremost linguist
- Old college group embracing good skilled linguist
- Language master college caught snorting line
- Former college student dons understood in various languages
- Linguist in college once moved across lake
- Old college has good fortune to be multilingual
Buddy explains!

The straight part
We know that "Language master" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case language master = polyglot.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.
What does POLYGLOT mean?
POLYGLOT noun- One who has mastered, notably speaks, several languages.
- A publication containing several versions of the same text, or the same subject matter in several languages; especially, the Bible in several languages.
- A mixture of languages or nomenclatures.
- A program written in multiple programming languages.
- A file that can be validly interpreted as multiple formats.
- Versed in, or speaking, many languages.
- Containing, or made up of, several languages.
- Comprising various linguistic groups.