Cryptic crossword clue
Alcoholic drinking Pepsi sadly, most sentimental 8

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

I've seen this crossword clue in The Guardian
S
O
P
P
I
E
S
T

Buddy explains!

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

SOPPIEST adjective
  1. Very wet; sodden, soaked.
  2. Sentimental, maudlin, schmaltzy.

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