Snickers that's disgusting after sandwiches (8)
I believe the answer is:
laughter
'snickers that's' is the definition.
I can't judge whether this defines the answer.
'disgusting after sandwiches' is the wordplay.
'disgusting' becomes 'ugh'.
'after' becomes 'later' (I've seen this in another clue).
'sandwiches' indicates putting letters inside (to sandwich is to block something in).
'ugh' put within 'later' is 'LAUGHTER'.
Can you help me to learn more?
(Other definitions for laughter that I've seen before include "A manifestation of joy" , "The expression of lively amusement" , "Howling" , "Sound of amusement" , "Hilarity" .)