Cryptic crossword clue
WW1’s new day welcomes greeting by both sides in turmoil 9

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

I've seen this crossword clue in The Guardian
W
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Buddy explains!

The straight part
We know that "urmoil" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case urmoil = whirlwind.
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 WHIRLWIND mean?

WHIRLWIND noun
  1. A violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion.
  2. A person or body of objects or events sweeping violently onward.
WHIRLWIND adjective
  1. Rapid and minimal: a whirlwind tour, a whirlwind romance.

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