Passing test, ran in drunk! (9)
I believe the answer is:
transient
'passing' is the definition.
('transient' can be a synonym of 'passing')
'test ran in drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'test'+'ran'+'in'='testranin'
'testranin' with letters rearranged gives 'TRANSIENT'.
(Other definitions for transient that I've seen before include "Passing, short-lived" , "gone in a trice!" , "Temporary worker" , "Lasting little time" , "fugitive" .)