Cryptic crossword clue
Send letter to us that’s left out? On the contrary, by the sound of it 5,2

The most common and most likely answer to this crossword clue is the 5 plus 2 letter word WRITE IN

I've seen this crossword clue in The Guardian
W
R
I
T
E
I
N

Buddy explains!

The straight part
We know that "Send letter to us" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case send letter to us = write in.
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 WRITE IN mean?

WRITE IN noun
  1. A candidate whose name is not listed on the ballot.
  2. A vote made for a candidate of this kind.
WRITE IN adjective
  1. Pertaining to a write-in.

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