Sentimental stuff (4)
I believe the answer is:
corn
'sentimental stuff' is the definition.
(corn or corniness can mean sentimental material)
This is the entire clue.
(Other definitions for corn that I've seen before include "In song from 'Oklahoma' this is as high as an elephant's eye" , "Hard thickening of the skin on a toe" , "Get drunk commonly" , "Grain - thick skin" , "Maize" .)