Cryptic crossword clue
Expressed clearly for Greek character on preceding day

The most common and most likely answer to this crossword clue is the 10 letter word FORMULATED

I've seen this crossword clue in Independent
F
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Buddy explains!

The straight part
We know that "Expressed clearly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case expressed clearly = formulated.
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 FORMULATED mean?

FORMULATED verb
  1. To reduce to, or express in, a formula; to put in a clear and definite form of statement or expression.

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