The most common and most likely answer to this crossword clue is the 6 letter word LAMBDA
L
A
M
B
D
A
More clues leading to the result LAMBDA
- Dear Fatherin a letter of Cavafy’s
- Letter for one young Suffolk lawyer
- Gentle beast beginning to dislike a character from Greece
- Beat bad, corrupt Greek character
- Something written in Greek requirement for moussaka: nearly 24 hours
- Lady Caroline beginning to draft a letter
- Character in Sophocles, essayist and lawyer
- One easily deceived by lawyer’s letter
- Greek character with bad back’s terribly bad
- Foreign character English author ‘ad turned up
Buddy explains!

The straight part
We know that "a letter of Cavafy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a letter of cavafy = lambda.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 LAMBDA mean?
LAMBDA noun- The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.
- Unit representation of wavelength.
- The cosmological constant.
- A lambda expression.
- The junction of the lambdoid and sagittal sutures of the cranium
- A lambda baryon
- The percentage change in an option value divided by the percentage change in the underlying asset's price.