The most common and most likely answer to this crossword clue is the 9 letter word BLOCKHEAD
I've seen this crossword clue in Financial Times
B
L
O
C
K
H
E
A
D
More clues leading to the result BLOCKHEAD
- One’s a fool to obstruct chief
- Awful tackling rugby player, that man Charlie
- Stop boss being an idiot
- British rugby player kept consuming drug, being an idiot
- Rugby player, he punches awful idiot
- Bath’s no.1 forward Thiebaud regularly getting sent off, the idiot
- Criminal outside bar meets man getting dope
Buddy explains!

The straight part
We know that "Charlie" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case charlie = blockhead.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 BLOCKHEAD mean?
BLOCKHEAD noun- A stupid person.
- A sideshow performer who hammers nails or similar items through his or her nostril into the nasal cavity; human blockhead.
- To perform as a human blockhead.
- To behave in a stupid manner.