Cryptic crossword clue
Paid back by the hour with silver - 1000 for separating membrane 9

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

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Buddy explains!

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

DIAPHRAGM noun
  1. In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.
  2. Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
  3. A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
  4. A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber as the difference in the pressure in the chambers varies.
  5. (acoustics) In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
  6. A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
  7. A permeable or semipermeable membrane.
  8. A floor slab, metal wall panel, roof panel or the like, having a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.
DIAPHRAGM verb
  1. To reduce lens aperture using an optical diaphragm.
  2. To act as a diaphragm, for example by vibrating.

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