The most common and most likely answer to this crossword clue is the 11 letter word FIRECRACKER
I've seen this crossword clue in Independent
F
I
R
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C
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A
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K
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Buddy explains!
The straight part
We know that "It’ll lead to an explosion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’ll lead to an explosion = firecracker.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.