The most common and most likely answer to this crossword clue is the 6 letter word DRIPPY
I've seen this crossword clue in Financial Times
D
R
I
P
P
Y
More clues leading to the result DRIPPY
Buddy explains!
The straight part
We know that "Sentimental" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sentimental = drippy.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 DRIPPY mean?
DRIPPY adjective- Dripping or tending to drip.
- Rainy or wet.
- Maudlin, tiresome or annoying;