The most common and most likely answer to this crossword clue is the 5 plus 4 letter word BILLY GOAT
I've seen this crossword clue in The Guardian
B
I
L
L
Y
G
O
A
T
Buddy explains!
The straight part
We know that "Charge enemy finally — viciously attack male beast (5,4)/male beast" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case charge enemy finally — viciously attack male beast (5,4)/male beast = billy goat.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 BILLY GOAT mean?
BILLY GOAT noun- A male goat.