Cryptic crossword clue
Letters he has put in post to North and South? It’s left, if not right 10

The most common and most likely answer to this crossword clue is the 10 letter word HANDEDNESS

I've seen this crossword clue in The Guardian
H
A
N
D
E
D
N
E
S
S

Buddy explains!

The straight part
We know that "It’s left, if not right" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s left, if not right = handedness.
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 HANDEDNESS mean?

HANDEDNESS noun
  1. The property that distinguishes an asymmetric object from its mirror image. For example, the essential difference between a left and right glove.
  2. A preference (usually innate) for using one hand rather than the other.

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