Test failed as you were (4)
I believe the answer is:
stet
'as you were' is the definition.
(publishing term)
'test failed' is the wordplay.
'failed' indicates an anagram.
'test' with letters rearranged gives 'STET'.
(Other definitions for stet that I've seen before include "Proofreader's mark that the original text should be kept" , "'Let it stand, in printing (4)'" , "Instruction to ignore amendment" , "This must not be changed" , "marginal instruction" .)