Cryptic crossword clue
Coach under way past square 4-2-4

The most common and most likely answer to this crossword clue is the 12 letter word FOUR-IN-HAND

I've seen this crossword clue in The Times
F
O
U
R
-
I
N
-
H
A
N
D

Buddy explains!

The straight part
We know that "Coach" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coach = four-in-hand.
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 FOUR-IN-HAND mean?

FOUR-IN-HAND noun
  1. A carriage drawn by four horses controlled by one driver; a coach-and-four.
  2. A slip knot with one end hanging in front of the other; a simple necktie.

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