The most common and most likely answer to this crossword clue is the 6 letter word PRIMED
I've seen this crossword clue in The Daily Telegraph
P
R
I
M
E
D
More clues leading to the result PRIMED
Buddy explains!
The straight part
We know that "briefed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case briefed = primed.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 PRIMED mean?
PRIMED verb- To prepare a mechanism for its main work.
- To apply a coat of primer paint to.
- To be renewed.
- To serve as priming for the charge of a gun.
- (of a steam boiler) To work so that foaming occurs from too violent ebullition, which causes water to become mixed with, and be carried along with, the steam that is formed.
- To apply priming to (a musket or cannon); to apply a primer to (a metallic cartridge).
- To prepare; to make ready; to instruct beforehand; to coach.
- To trim or prune.
- To mark with a prime mark.
- Prepared for use or action.