The most common and most likely answer to this crossword clue is the 3 letter word TAG
I've seen this crossword clue in The Guardian
T
A
G
More clues leading to the result TAG
- Beginning to tie silver label
- Tie-on label cheers granny at first
- Name game
- Label’s strange with odd letters missing
- Wicket perhaps overturned endlessly in game
- Name? Suggestion is to drop name
- Handle of American pistol that’s a revolver!
- Retired gun dog
- Barring outsiders, put on children’s game
- Stagecoach’s label
Buddy explains!

The straight part
We know that "Label" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case label = tag.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 TAG mean?
TAG noun- A small label.
- A children's chasing game in which one player (known as "it") attempts to touch another, who then becomes "it".
- A skin tag, an excrescence of skin.
- A type of cardboard.
- Graffiti in the form of a stylized signature particular to the artist.
- A dangling lock of sheep's wool, matted with dung; a dung tag.
- (authorship) An attribution in narrated dialogue (eg, "he said") or attributed words (e.g. "he thought").
- The last line (or last two lines) of a song's chorus that is repeated to indicate the end of the song.
- The last scene of a TV program that often focuses on the program's subplot.
- A vehicle number plate; a medal bearing identification data (animals, soldiers).
- An instance of touching the baserunner with the ball or the ball in a gloved hand to rule him "out."
- A piece of markup representing an element in a markup language.
- A keyword, term, or phrase associated with or assigned to data, media, and/or information enabling keyword-based classification; often used to categorize content.
- Any slight appendage, as to an article of dress; something slight hanging loosely.
- A metallic binding, tube, or point, at the end of a string, or lace, to stiffen it.
- The end, or catchword, of an actor's speech; cue.
- Something mean and paltry; the rabble.
- A sheep in its first year.
- Any short peptide sequence artificially attached to proteins mostly in order to help purify, solubilize or visualize these proteins.
- A person's name.
- To label (something).
- (graffiti) To mark (something) with one’s tag.
- To remove dung tags from a sheep.
- To hit the ball hard.
- To put a runner out by touching them with the ball or the ball in a gloved hand.
- To mark with a tag (metadata for classification).
- To follow closely, accompany, tag along.
- To catch and touch (a player in the game of tag).
- To fit with, or as if with, a tag or tags.
- To fasten; to attach.
- A decoration drawn over some Hebrew letters in Jewish scrolls.