The most common and most likely answer to this crossword clue is the 7 letter word DESPOIL
I've seen this crossword clue in Financial Times
D
E
S
P
O
I
L
More clues leading to the result DESPOIL
- Oddly, dress Penny with possibly crude sack
- Rifle shot polished husband off!
- Ruin poor oldies parking at the centre
- I start to laugh after autocrat almost gets sack
- Sack, oddly lopsided, cut short
- Rob dictator unendingly – I have last to fail
- Strip of French land including left bank in Paris
- Director George Lucas ultimately turning cheek, taking Oscar loot
- Rifle is sloped I fancy
- Loot is piled so high
Buddy explains!

The straight part
We know that "sack" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sack = despoil.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 DESPOIL mean?
DESPOIL noun- Plunder; spoliation.
- To plunder; to pillage; take spoil from.
- To violently strip (someone), with indirect object of their possessions etc.; to rob.
- To strip (someone) of their clothes; to undress.