8 down
Left
supporter
for
very
brief
moment
(5,6)
Left supporter for very brief moment (5,6)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
Look at very brief moment — that's your definition, a tiny fraction of time. Then it's built piece by piece: left gives you SPLIT (as in departed, gone), and supporter gives you SECOND (as in someone who seconds a motion).