The most common and most likely answer to this crossword clue is the 7 letter word HARPOON
H
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P
O
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N
More clues leading to the result HARPOON
- Talk tediously about old hunting weapon
- Keep talking about old weapon
- Marx talking about object of whaling industry?
- Talk incessantly about old weapon
- Talk endlessly about love being a weapon
- Marx discussing weapon
- Brother unable to speak regarding weapon
- Endlessly make point holding old spear
- Talk show hostess upset about threat to whales
- One’s cast out at sea — gets to talk endlessly about nothing
Buddy explains!

The straight part
We know that "One’s cast out at sea" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s cast out at sea = harpoon.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 HARPOON mean?
HARPOON noun- A spearlike weapon with a barbed head used in hunting whales and large fish.
- A harmonica.
- To shoot something with a harpoon.