Amuse oneself for a bit (6)
I believe the answer is:
trifle
I believe this clue is a double definition.
'amuse oneself' is the first definition.
(I've seen this before)
'a bit' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for trifle that I've seen before include "A mere dessert?" , "Treat frivolously" , "Triviality" , "A small portion" , "Mess" .)