The most common and most likely answer to this crossword clue is the 6 letter word ORGASM
I've seen this crossword clue in The Guardian
O
R
G
A
S
M
More clues leading to the result ORGASM
Buddy explains!

The straight part
We know that "can be explosive!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can be explosive! = orgasm.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 ORGASM mean?
ORGASM noun- A spasm or sudden contraction.
- A rush of sexual excitement; now specifically, the climax or peak of sexual pleasure, which occurs during sexual activity and which in males may include ejaculation and in females vaginal contractions.
- A creamy white alcoholic cocktail containing amaretto, Irish cream, and coffee liqueur.
- To have an orgasm.