Cryptic crossword clue
Unknown pots, first seen at back, most attractive 8

The most common and most likely answer to this crossword clue is the 8 letter word YUMMIEST

Y
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Buddy explains!

The straight part
We know that "most attractive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most attractive = yummiest.
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 YUMMIEST mean?

YUMMIEST adjective
  1. (lighthearted) Delicious.

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