Cryptic crossword clue
One flap extremely unusual on adult hip bone sockets 9

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

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "hip bone sockets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hip bone sockets = acetabula.
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 ACETABULA mean?

ACETABULA noun
  1. The bony cup of the pelvis which receives the head of the femur.
  2. The cavity in which the leg of an insect is inserted at its articulation with the body.
  3. A sucker of the sepia or cuttlefish and related animals.
  4. The large posterior sucker of the leeches.
  5. One of the lobes of the placenta in ruminating animals.
  6. (Roman Antiquities) A vinegar cup.
  7. (Roman Antiquities) The socket of the hipbone.
  8. (Roman Antiquities) A measure of about one eighth of a pint.

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