The most common and most likely answer to this crossword clue is the 6 letter word HOONED
H
O
O
N
E
D
Buddy explains!
The straight part
We know that "acted like a lout" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case acted like a lout = hooned.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 HOONED mean?
HOONED verb- To act loutishly; specifically, to drive excessively quickly, loudly or irresponsibly.
- To make a hooting or howling sound.