Cryptic crossword clue
Overenthusiastic facial tan going wrong 9

The most common and most likely answer to this crossword clue is the 9 letter word FANATICAL

I've seen this crossword clue in The Sunday Telegraph
F
A
N
A
T
I
C
A
L

Buddy explains!

The straight part
We know that "Overenthusiastic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overenthusiastic = fanatical.
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 FANATICAL mean?

FANATICAL adjective
  1. Having an extreme, irrational zeal or enthusiasm for a specific cause.

Latest crossword clues with full explanations