Triviality (6)
I believe the answer is:
trifle
'triviality' is the definition.
(I know that triviality can be written as trifle)
This is all the clue.
(Other definitions for trifle that I've seen before include "Touch" , "A bit" , "Toy; a sweet" , "Pudding - bagatelle" , "more than half of 13 [AFTERSHAVE], for example" .)