The most common and most likely answer to this crossword clue is the 10 letter word THEATRICAL
I've seen this crossword clue in Financial Times
T
H
E
A
T
R
I
C
A
L
More clues leading to the result THEATRICAL
- Overdone, as ham so annoyingly is
- Dramatic recital that almost worked
- Articles about wearing suit in camp
- Melodramatic article on a hearing involving clubs
- OTT article – hat, perhaps
- The average grade in a test for stage
- Dramatic act the liar arranged
- Variation of heat and cold in test affected
- Camp very warm – work suspended while warmth’s accommodated
- Performing Lear, hit act gets histrionic
Buddy explains!

The straight part
We know that "Overdone" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overdone = theatrical.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 THEATRICAL mean?
THEATRICAL noun- A stage performance, especially one by amateurs.
- A commercially produced film to be shown in movie theaters.
- Of or relating to the theatre.
- Fake and exaggerated.