The most common and most likely answer to this crossword clue is the 9 letter word ANIMALISM
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More clues leading to the result ANIMALISM
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The straight part
We know that "Cow-worshipper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cow-worshipper = animalism.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 ANIMALISM mean?
ANIMALISM noun- The doctrine that humans are merely animals, and lack any spirituality.
- The enjoyment of physical appetites.
- (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.