The most common and most likely answer to this crossword clue is the 9 letter word PANTHEISM
I've seen this crossword clue in The Times
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More clues leading to the result PANTHEISM
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The straight part
We know that "worship" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worship = pantheism.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 PANTHEISM mean?
PANTHEISM noun- The belief that the Universe is in some sense divine and should be revered. Pantheism identifies the universe with God but denies any personality or transcendence of such a God.
- The belief in all gods; omnitheism.