Trite or mawkish (5)
I believe the answer is:
corny
This clue is a double definition.
'trite' is the first definition.
(I've seen this in another clue)
'mawkish' is the second definition.
(I've seen this in another clue)
(Other definitions for corny that I've seen before include "Informally cliched and overly sentimental - like sore foot?" , "Hackneyed" , "Over-sentimental; trite" , "Trite, sentimental" , "Not original" .)