The most common and most likely answer to this crossword clue is the 7 letter word STICKER
I've seen this crossword clue in The Guardian
S
T
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More clues leading to the result STICKER
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 = sticker.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 STICKER mean?
STICKER noun- Something or someone that sticks.
- One who sticks to something, or does not give up; a stayer.
- An adhesive label or decal.
- A price tag.
- (by extension) The listed price (also sticker price).
- A cartoonish illustration of a character that represents an emotion or action, often accompanied by text, that may be superimposed on a digital image.
- A burr or seed pod that catches in fur or clothing.
- That which causes one to stick; that which puzzles or poses.
- A wooden strip placed between courses of lumber to allow air circulation (also kiln sticker).
- A small wooden rod in an organ which connects (in part) a key and a pallet, so as to communicate motion by pushing.
- A brand, label, or company, especially one making and distributing records.
- A paster.
- To apply one or more stickers to (something)
- To mark as the sticker price
- Likely to stick; sticking, sticky.