The most common and most likely answer to this crossword clue is the 11 letter word IRRADIATING
I
R
R
A
D
I
A
T
I
N
G
Buddy explains!

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 IRRADIATING mean?
IRRADIATING verb- To throw rays of light upon; to illuminate; to brighten; to adorn with luster.
- To enlighten intellectually; to illuminate.
- To animate by heat or light.
- To radiate, shed, or diffuse.
- To decorate with shining ornaments.
- To emit rays; to shine.
- To apply radiation to.