Cryptic crossword clue
Reason to switch plan for ultimate rejoicing 10

The most common and most likely answer to this crossword clue is the 10 letter word EXULTATION

I've seen this crossword clue in The Times
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Buddy explains!

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

EXULTATION noun
  1. The act of exulting; great joy at success or victory, or at any advantage gained; rapturous delight

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