The most common and most likely answer to this crossword clue is the 7 letter word MAWKISH
I've seen this crossword clue in Financial Times
M
A
W
K
I
S
H
More clues leading to the result MAWKISH
- Soppy mouth attracting kiss from drunken lips?
- Maudlin knight hampered by desire to follow mum
- Sentimental single initially released by US band – covered by Wham, surprisingly
- ‘Soppy Chops’ gets half of kisses planted by Henry
- Week I laid in military hospital, sickly
- Man and wife locked in a never-ending smooch — hot and sentimental
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 = mawkish.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 MAWKISH mean?
MAWKISH adjective- Feeling sick, queasy.
- Sickening or insipid in taste or smell.
- Excessively or falsely sentimental; showing a sickly excess of sentiment; maudlin.