Cryptic crossword clue
Checkout lines 7

The most common and most likely answer to this crossword clue is the 7 letter word BARCODE

I've seen this crossword clue in The Daily Telegraph
B
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Buddy explains!

The straight part
We know that "Checkout lines" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case checkout lines = barcode.
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 BARCODE mean?

BARCODE noun
  1. Any set of machine-readable parallel bars or concentric circles, varying in width, spacing, or height, encoding information according to a symbology
  2. A portion of a gene that identifies a particular species

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