The most common and most likely answer to this crossword clue is the 7 letter word LEISTER
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More clues leading to the result LEISTER
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The straight part
We know that "weapon for spearing fish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weapon for spearing fish = leister.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 LEISTER mean?
LEISTER noun- A spear armed with three or more barbed prongs for catching fish, particularly salmon.
- To catch or spear (fish) with a leister.