Cryptic crossword clue
Urgent – plump in the middle? See lens measurement 7

The most common and most likely answer to this crossword clue is the 7 letter word DIOPTRE

D
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Buddy explains!

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

DIOPTRE noun
  1. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
  2. The dioptre adjustment mechanism of a pair of binoculars.
  3. Any lens system, such as a telescope.
  4. A theodolite or similar surveyor’s angle measuring device.
  5. An alidade.
  6. A surgical speculum.
  7. An instrument for drawing the skull by projections.

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