Cryptic crossword clue
Diagnostic technique upset dour sultan 10

The most common and most likely answer to this crossword clue is the 10 letter word ULTRASOUND

I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result ULTRASOUND

Buddy explains!

The straight part
We know that "Diagnostic technique" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case diagnostic technique = ultrasound.
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 ULTRASOUND mean?

ULTRASOUND noun
  1. Sound with a frequency greater than the upper limit of human hearing, which is approximately 20 kilohertz.
  2. The use of ultrasonic waves for diagnostic or therapeutic purposes.
ULTRASOUND verb
  1. To treat with ultrasound.

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