Cryptic crossword clue
Office chat about the letters

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

I've seen this crossword clue in The Guardian
P
O
S
T
B
A
G


Buddy explains!

The straight part
We know that "the letters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the letters = postbag.
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 POSTBAG mean?

POSTBAG noun
  1. A bag used for carrying post (mail)

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