The most common and most likely answer to this crossword clue is the 10 letter word SEQUENCING
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Buddy explains!
The straight part
We know that "Ordering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ordering = sequencing.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 SEQUENCING mean?
SEQUENCING verb- To arrange in an order
- To determine the order of things, especially of amino acids in a protein, or of bases in a nucleic acid
- To produce (music) with a sequencer
- Arrangement in a sequence.
- The procedure of determining the order of amino acids in the polypeptide chain of a protein (protein sequencing) or of nucleotides in a DNA section comprising a gene (gene sequencing).