Cryptic crossword clue
Strict order of mail train so arranged 13

The most common and most likely answer to this crossword clue is the 13 letter word FORMALISATION

I've seen this crossword clue in The Times
F
O
R
M
A
L
I
S
A
T
I
O
N

Buddy explains!

The straight part
We know that "Strict order" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strict order = formalisation.
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.

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