The most common and most likely answer to this crossword clue is the 2 letter word EN
E
N
Buddy explains!

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 EN mean?
EN noun- (plural) The people of England; Englishmen and Englishwomen.
- (Amish, plural) The non-Amish; non-Amish people.
- Ability to employ the English language correctly or idiomatically.
- The English-language term or expression for something.
- Specific language or wording in English; English text or statements in speech, whether in translation or otherwise.
- A size of type between pica (12 point) and great primer (18 point), standardized as 14-point.
- Plain or readily understandable English language.
- Spin or sidespin given to a ball, especially in pool or billiards.
- The name of the Latin-script letter N.
- A unit of measurement equal to half an em (half the height of the type in use).
- Used in various phrases borrowed from French or formed as if borrowed from French (see "Derived terms" below).