The most common and most likely answer to this crossword clue is the 8 letter word CLAMOURS
I've seen this crossword clue in The Daily Telegraph
C
L
A
M
O
U
R
S
Buddy explains!

The straight part
We know that "Outcries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outcries = clamours.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 CLAMOURS mean?
CLAMOURS noun- A great outcry or vociferation; loud and continued shouting or exclamation.
- Any loud and continued noise.
- A continued public expression, often of dissatisfaction or discontent; a popular outcry.
- To cry out and/or demand.
- To demand by outcry.
- To become noisy insistently.
- To influence by outcry.
- To silence.
- To salute loudly.
- To stun with noise.
- To repeat the strokes quickly on (bells) so as to produce a loud clang.