Soppy (7)
I believe the answer is:
mawkish
'soppy' is the definition.
(I know that soppy can be written as mawkish)
This is all the clue.
(Other definitions for mawkish that I've seen before include "Insipid; maudlin" , "Sentimental, schmaltzy" , "Feebly sentimental" , "Sentimental in maudlin way" , "Cloying" .)