Cryptic crossword clue
Greetings around the world performed with this? 2-2

The most common and most likely answer to this crossword clue is the 4 letter word YOYO

I've seen this crossword clue in Independent
Y
O
Y
O

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

YOYO noun
  1. A toy consisting of a spheroidal or cylindrical spindle having a circular groove in which string is wound; it is used by holding the string in the fingers and reeling the spindle up and down by movements of the wrist.
  2. A volatile market that moves up and down.
  3. Someone who vacillates.
  4. A cloth rosette formed by gathering the outside edge of a circle of fabric in toward the centre using a running stitch.
  5. A foolish, annoying or incompetent person.
YOYO verb
  1. To vacillate; to move up and down.

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