The most common and most likely answer to this crossword clue is the 9 letter word CONQUERED
I've seen this crossword clue in The Daily Telegraph
C
O
N
Q
U
E
R
E
D
More clues leading to the result CONQUERED
Buddy explains!

The straight part
We know that "Beat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case beat = conquered.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 CONQUERED mean?
CONQUERED verb- To defeat in combat; to subjugate.
- To acquire by force of arms, win in war.
- To overcome an abstract obstacle.
- To gain, win, or obtain by effort.