The most common and most likely answer to this crossword clue is the 7 letter word EPSILON
E
P
S
I
L
O
N
More clues leading to the result EPSILON
- One slip ruined Greek character
- Greek character’s crumbling pen outside farm store
- Noel failing to receive one Greek letter or another
- European problem in speech reflected on Greek character
- No speech impediment Earl picked up from Greek character
- One Greek character or another abandoning university after end of course
- Greek character's record still regularly being played
- Character in record store close to Bonn
- Greek character recording wild lions
- Foreign character records dancing lion
Buddy explains!

The straight part
We know that "Greek character" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case greek character = epsilon.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 EPSILON mean?
EPSILON noun- The name for the fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
- In IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel.
- An arbitrarily small quantity.
- A negligible effect.
- The percentage change in an option value with respect to the underlying dividend yield.