The most common and most likely answer to this crossword clue is the 6 letter word LOOTED
I've seen this crossword clue in The Daily Telegraph
L
O
O
T
E
D
Buddy explains!

The straight part
We know that "stole from" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stole from = looted.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 LOOTED mean?
LOOTED verb- To steal, especially as part of war, riot or other group violence.
- To steal from.
- To examine the corpse of a fallen enemy for loot.