The most common and most likely answer to this crossword clue is the 8 letter word PILLAGER
I've seen this crossword clue in The Daily Telegraph
P
I
L
L
A
G
E
R
More clues leading to the result PILLAGER
- Tablet, one not rejuvenating, spoils taker
- Person stealing beer wants second drink
- Prolific robber making insolent comment brought back alcoholic drink
- One forcibly taking one beer after another, endlessly
- Czech beerhasn’t succeeded for marauder
- Quiet member of small community knocking out very violent robber?
Buddy explains!
The straight part
We know that "Prolific robber" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case prolific robber = pillager.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.