The most common and most likely answer to this crossword clue is the 9 letter word BUCCANEER
I've seen this crossword clue in The Guardian
B
U
C
C
A
N
E
E
R
More clues leading to the result BUCCANEER
- Pirate, thriller writer’s said, always poetic
- Pirate thriller writer discussed always
- I’d say young US man is able to pick up a Corsair
- Pirate with a pair of $1 earrings, we hear
- Pirate cure can be fake
- Dollar per seed-head quoted for chancer
- Criminal can be cured? Not quite: one robs in the main
- Retreating youngster can always become an adventurer
- Robber can be cruel, horrible, stealing pounds
- Money abroad informally given by a faculty reportedly for opportunist
Buddy explains!

The straight part
We know that "Corsair" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case corsair = buccaneer.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 BUCCANEER mean?
BUCCANEER noun- Any of a group of seamen who cruised on their own account on the Spanish Main and in the Pacific in the 17th century, who were similar to pirates but did not prey on ships of their own nation.
- A pirate.
- To engage in piracy against any but one's own nation's ships.