The most common and most likely answer to this crossword clue is the 5 letter word GAMMA
G
A
M
M
A
More clues leading to the result GAMMA
- Poor mark in school given by master
- Third grade glossy turned over by graduate
- Greek character in school with arts degree
- Character from Plato’s mostly lame answer
- Written backwards in telegram, magical letter from Greece
- Delta follows it a short distance into Georgia
- Letter from school to mother
- Letter in scam magician set up
- Classical character’s publication diverted graduate
- Graduate school first to get low grade
Buddy explains!

The straight part
We know that "found just before delta" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case found just before delta = gamma.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 GAMMA mean?
GAMMA noun- The third letter of the Greek alphabet (Γ, γ), preceded by beta (Β, β) and followed by delta, (Δ, δ).
- The Gamma function, symbolized by Γ.
- A constant approximately equal to 0.55721566, symbolized by γ (also known as the Euler–Mascheroni constant).
- A non-SI unit of measure of magnetic flux density, equal to 1 nT.
- (industries) slope of log-log plot of video input and luminance output.
- A second-order measure of derivative price sensitivity, expressed as the rate of change in delta with respect to changes in the underlying asset price.
- A nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems.