The most common and most likely answer to this crossword clue is the 6 letter word CANDID
I've seen this crossword clue in The Times
C
A
N
D
I
D
More clues leading to the result CANDID
Buddy explains!

The straight part
We know that "Outspoken" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outspoken = candid.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 CANDID mean?
CANDID noun- A spontaneous or unposed photograph.
- Impartial and free from prejudice.
- Straightforward, open and sincere.
- Not posed or rehearsed.