Outcome of a trial? (5)
I believe the answer is:
error
'outcome of a trial?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for error that I've seen before include "Blunder or mistake" , "1 down" , "Bug" , "Howler" , "Slip, mistake" .)