Analyse a mechanical failure (9)
I believe the answer is:
breakdown
I believe this is a double definition.
'analyse' is the first definition.
(to break something down is to analyse it)
'a mechanical failure' is the second definition.
(I've seen this before)
(Other definitions for breakdown that I've seen before include "Detailed analysis" , "Mechanical failure" , "Nervous disorder" , "Stop working" , "psychological crisis" .)