The most common and most likely answer to this crossword clue is the 4 plus 3 letter word CALL OUT
I've seen this crossword clue in Financial Times
C
A
L
L
O
U
T
More clues leading to the result CALL OUT
Buddy explains!
The straight part
We know that "Yell" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case yell = call out.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.
Crossword Answer definitions
CALL OUT noun- (communication) An outgoing telephone call.
- An invitation to fight; the act of one child calling out another.
- (graphic layout) A pull quote: an excerpt from an article (such as in a news magazine) that is duplicated in a large font alongside the article so as to grab a reader's attention and indicate the article's topic.
- A summons to someone designated as being on call.
- A meeting or rally held in order to find interested participants, e.g. for an activity or sports team.
- An annotation that pertains to a specific location in a body of text or a graphic, and that is visually linked to that location by a mark or a matching pair of marks.
- The act of calling out from work, i.e. announcing that one cannot attend.