The most common and most likely answer to this crossword clue is the 9 letter word SPEEDBOAT
I've seen this crossword clue in The Times
S
P
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D
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More clues leading to the result SPEEDBOAT
- What may be ending in drop to seabed after accident?
- Craft putting stoat’s tail on pelt stole
- Recovered from seabed — top racing vessel
- End in trip to seabed, after wrecking? It might
- Essence of sung message to encourage escape of Prince in vessel
- Launch full of drugs?
- Depot and base renovated marine vehicle
- Does BP fluctuate when tea is brewed in a vessel
Buddy explains!

The straight part
We know that "What may be ending in drop to seabed after accident?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what may be ending in drop to seabed after accident? = speedboat.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 SPEEDBOAT mean?
SPEEDBOAT noun- A fast boat, usually small (for 1-8 people).
- A boat designed and built for racing.
- A boat used for waterskiing.
- To travel by speedboat.