Mawkish, sentimental (5)
I believe the answer is:
soppy
This clue is a double definition.
'mawkish' is the first definition.
(I know that mawkish can be written as soppy)
'sentimental' is the second definition.
(I know that sentimental can be written as soppy)
(Other definitions for soppy that I've seen before include "Feebly sentimental" , "Silly" , "Mushy" , "Overemotional" , "Lovey-dovey" .)