Cryptic crossword clue
Polite to keep decorum every second when inside trains 9

The most common and most likely answer to this crossword clue is the 9 letter word COURTEOUS

C
O
U
R
T
E
O
U
S

Buddy explains!

The straight part
We know that "Polite" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case polite = courteous.
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 COURTEOUS mean?

COURTEOUS adjective
  1. Showing regard or thought for others; especially, displaying good manners or etiquette.

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