Court proceedings in Austria lengthy (5)
I believe the answer is:
trial
'court proceedings' is the definition.
(I've seen this before)
'in austria lengthy' is the wordplay.
'in' says the answer is hidden in the clue.
'TRIAL' is hidden in the letters of 'austria lengthy'.
(Other definitions for trial that I've seen before include "Proceedings to determine guilt or innocence" , "Legal hearing" , "Ordeal, perhaps in court" , "Test of ability" , "Court examination; test" .)