Nailed, as a test (4)
I believe the answer is:
aced
'nailed as a test' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aced that I've seen before include "Comprehensively beaten" , "got a hole in one" , "Reached a golf hole in one shot" , "passed with highest marks in US" , "Sailed through" .)