The most common and most likely answer to this crossword clue is the 12 letter word CHOREOGRAPHY
I've seen this crossword clue in The Guardian
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More clues leading to the result CHOREOGRAPHY
Buddy explains!
The straight part
We know that "Routine arrangements for trippers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case routine arrangements for trippers = choreography.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 CHOREOGRAPHY mean?
CHOREOGRAPHY noun- The art of creating, arranging and recording the dance movements of a work, such as a ballet.
- The dance steps, sequences or styles peculiar to a work, group, performance or institution.
- The representation of these movements by a series of symbols.
- The notation used to construct this record.