Subsequent amusement concealing expression of disgust (5)
I believe the answer is:
later
'subsequent' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for later that I've seen before include "When to see you?" , "more modern" , "succeeding" , "More recent" , "Tardier" .)