The most common and most likely answer to this crossword clue is the 6 letter word POLICE
I've seen this crossword clue in The Guardian
P
O
L
I
C
E
More clues leading to the result POLICE
Buddy explains!

The straight part
We know that "Force" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case force = police.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 POLICE mean?
POLICE noun- A civil force granted the legal authority for law enforcement and maintaining public order.
- A police officer.
- People who seek to enforce norms or standards.
- The duty of cleaning up.
- Policy.
- Communal living; civilization.
- The regulation of a given community or society; administration, law and order etc.
- To enforce the law and keep order among (a group).
- To clean up an area.
- To enforce norms or standards upon.