The most common and most likely answer to this crossword clue is the 9 letter word OVERJOYED
I've seen this crossword clue in The Guardian
O
V
E
R
J
O
Y
E
D
More clues leading to the result OVERJOYED
Buddy explains!
The straight part
We know that "euphoric" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case euphoric = overjoyed.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 OVERJOYED mean?
OVERJOYED verb- To give great joy, delight or pleasure to
- Very happy.