The most common and most likely answer to this crossword clue is the 8 letter word PARANOID
P
A
R
A
N
O
I
D
More clues leading to the result PARANOID
- Suspicious bringing back Diana on a criminal charge?
- Suspicious old man fled before rendering of “I do”
- Pandora and I, racked with fear
- Like 5, reported to be angry and oversuspicious
- Highly suspicious soldier starts to notice odd incidents daily
- Soldier given no identity suffering mental disorder
- I pardon a wrong, harbouring unreasonable suspicions
- Detective facing a charge turned suspicious
- Detective, facing charge, turned suspicious
- Afraid of mean associate raising commotion about nothing
Buddy explains!

The straight part
We know that "Overly fearful" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overly fearful = paranoid.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 PARANOID mean?
PARANOID noun- Someone suffering from paranoia
- Of, related to, or suffering from paranoia
- Exhibiting extreme and irrational fear or distrust of others