The most common and most likely answer to this crossword clue is the 11 letter word FIRECRACKER
I've seen this crossword clue in The Daily Telegraph
F
I
R
E
C
R
A
C
K
E
R
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 FIRECRACKER mean?
FIRECRACKER noun- A small explosive device, typically containing a small amount of gunpowder in a tightly-wound roll of paper, primarily designed to produce a large bang.
- A peanut butter cracker baked with marijuana, similar in concept to an Alice B. Toklas brownie.
- A person who is exciting and/or unpredictable.