Foolishly sentimental (7)
(Other definitions for mawkish that I've seen before include "Falsely sentimental" , "Feebly sentimental" , "Cloying" , "Sentimental in maudlin way" , "Effusively or insincerely emotional" .)
'foolishly sentimental' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for maudlin that I've seen before include "Schmaltzy" , "Sloppily sentimental, perhaps due to drink" , "Over-emotional" , "Foolishly sentimental, mushy" , "Effusively or insincerely emotional" .)