Cryptic crossword clue
Letters provided by classics teachers maybe after school 6

The most common and most likely answer to this crossword clue is the 6 letter word GAMMAS

G
A
M
M
A
S

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The straight part
We know that "Letters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case letters = gammas.
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 GAMMAS mean?

GAMMAS noun
  1. The third letter of the Greek alphabet (Γ, γ), preceded by beta (Β, β) and followed by delta, (Δ, δ).
  2. The Gamma function, symbolized by Γ.
  3. A constant approximately equal to 0.55721566, symbolized by γ (also known as the Euler–Mascheroni constant).
  4. A non-SI unit of measure of magnetic flux density, equal to 1 nT.
  5. (industries) slope of log-log plot of video input and luminance output.
  6. 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.
GAMMAS noun
  1. A nonlinear operation used to encode and decode luminance or tristimulus values in video or still image systems.

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