The most common and most likely answer to this crossword clue is the 9 letter word HARPOONER
I've seen this crossword clue in The Times
H
A
R
P
O
O
N
E
R
More clues leading to the result HARPOONER
- A funny brother, exceptional person who has “a whale of a time”?
- Marx, remarkable person who spears his prey
- Marx discussing royalty, the main killer
- Queequeeg was an American comedian and a remarkable person
- Someone unable to speak, one runs, seeing killer at sea
- One making pointed attack on individuals in school?
Buddy explains!

The straight part
We know that "who spears his prey" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case who spears his prey = harpooner.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.