Cryptic crossword clue
Former head of nunnery into erotic dancing? On the contrary, that’s crap 9

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

I've seen this crossword clue in Financial Times
E
X
C
R
E
T
I
O
N

Buddy explains!

The straight part
We know that "crap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crap = excretion.
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 EXCRETION mean?

EXCRETION noun
  1. The process of removing or ejecting material that has no further utility, especially from the body; the act of excreting.
  2. Something being excreted in that manner, especially urine or feces.

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