Cryptic crossword clue
Preserved sandwiches of last month it’s learned 8

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

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

The straight part
We know that "learned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case learned = cultured.
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 CULTURED mean?

CULTURED verb
  1. To maintain in an environment suitable for growth (especially of bacteria) (compare cultivate)
  2. To increase the artistic or scientific interest (in something) (compare cultivate)
CULTURED adjective
  1. Learned in the ways of civilized society; civilized; refined.
  2. Artificially developed.

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