The most common and most likely answer to this crossword clue is the 7 letter word BOOTLEG
I've seen this crossword clue in The Guardian
B
O
O
T
L
E
G
More clues leading to the result BOOTLEG
- Sold illicitly from sack by stage
- Pirate in Merseyside port heading for Glasgow
- Merseyside town good for pirate
- Illegally made kick on limb
- Sold illicitly from sack next to stage
- Footwear on black market?
- In north-west town finally executing pirate
- Illegal recording of John, mostly bent over in toilet
- Kick member appearing as pirate
- Merseyside town’s good deal on the black market?
Buddy explains!

The straight part
We know that "pirate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pirate = bootleg.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 BOOTLEG mean?
BOOTLEG noun- The part of a boot that is above the instep.
- An illegally produced, transported or sold product; contraband.
- An unauthorized recording, e.g., of a live concert.
- A remix or mashup that is a combination of two songs but that is not authorized and audited for copyright use; primarily in the electronic music scene.
- A play in which the quarterback fakes a handoff, conceals the ball against his hip, and rolls out.
- To make, transport and/or sell illegal alcoholic liquor.
- To make, transport and/or sell an illegal version or copy of a copyrighted product.
- To engage in bootlegging.
- Illegally produced, transported or sold; pirated.