Cryptic crossword clue
Beastly behaviour from wild simian male tailless

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

I've seen this crossword clue in The Guardian
A
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M
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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does ANIMALISM mean?

ANIMALISM noun
  1. The doctrine that humans are merely animals, and lack any spirituality.
  2. The enjoyment of physical appetites.
  3. (ontology) A theory of personal identity which holds that persons are individual organisms of the species Homo sapiens, and the conditions of our persistence and identity are simply those of animals.

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