The most common and most likely answer to this crossword clue is the 7 letter word TAGGING
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More clues leading to the result TAGGING
Buddy explains!

The straight part
We know that "Labelling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case labelling = tagging.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 TAGGING mean?
TAGGING verb- 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.
- The act by which something is tagged.