The most common and most likely answer to this crossword clue is the 6 letter word RAIDED
I've seen this crossword clue in The Daily Telegraph
R
A
I
D
E
D
More clues leading to the result RAIDED
Buddy explains!

The straight part
We know that "attacked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attacked = raided.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 RAIDED mean?
RAIDED verb- To engage in a raid against.
- To lure from another; to entice away from.
- To indulge oneself by taking from.