The most common and most likely answer to this crossword clue is the 5 letter word VOCAL
I've seen this crossword clue in Independent
V
O
C
A
L
More clues leading to the result VOCAL
- Outspoken woman receiving military commander
- See boozer losing head, speaking loudly
- Loud, and very close to home? Not initially
- Very old colonel, awfully loud, first of all outspoken
- Girl round about inside far from reticent
- Outspoken little book about cases
- Outspoken and against the pub down the road not opening
- Loud eruption of Oval, when century’s bagged
- Such acclaim as Oval erupts about century
- Loud salvo calculated to conceal it
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 = vocal.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 VOCAL mean?
VOCAL noun- A vocal sound; specifically, a purely vocal element of speech, unmodified except by resonance; a vowel or a diphthong; a tonic element; a tonic; distinguished from a subvocal, and a nonvocal
- (Roman Catholic Church) A man who has a right to vote in certain elections.
- Of or pertaining to the voice or speech
- Having a voice
- Uttered or modulated by the voice; oral
- Of or pertaining to a voice sound; spoken
- Consisting of, or characterized by, voice, or tone produced in the larynx, which may be modified, either by resonance, as in the case of the vowels, or by obstructive action, as in certain consonants, such as v, l, etc., or by both, as in the nasals (m), (n), ng; sonant; intonated; voiced. See voice, and vowel
- Of or pertaining to a vowel; having the character of a vowel; vowel
- Loud; getting oneself heard.