The most common and most likely answer to this crossword clue is the 8 letter word HARSHEST
I've seen this crossword clue in Independent
H
A
R
S
H
E
S
T
More clues leading to the result HARSHEST
Buddy explains!
The straight part
We know that "most savage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most savage = harshest.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 HARSHEST mean?
HARSHEST adjective- Unpleasantly rough to the touch or other senses.
- Severe or cruel.