Cryptic crossword clue
They’ll sell you a porky scratching — it’s first on bar back 5

The most common and most likely answer to this crossword clue is the 5 letter word LIARS

I've seen this crossword clue in The Guardian
L
I
A
R
S

Buddy explains!

The straight part
We know that "They’ll sell you a porky" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’ll sell you a porky = liars.
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 LIARS mean?

LIARS noun
  1. One who tells lies.
  2. A swabber responsible for cleaning the outside parts of the ship rather than the cabins, a role traditionally assigned to a person caught telling a lie the previous week.

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