The most common and most likely answer to this crossword clue is the 7 plus 4 plus 3 letter word LIGHTER THAN AIR
L
I
G
H
T
E
R
T
H
A
N
A
I
R
Buddy explains!
The straight part
We know that "He is risen. Why" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he is risen. why = lighter than air.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 LIGHTER THAN AIR mean?
LIGHTER THAN AIR adjective- That is lighter than air, describing materials or aircraft.