Analysis of engine failure (9)
I believe the answer is:
breakdown
This clue might be a double definition.
'analysis' is the first definition.
(breakdown is a kind of analysis)
'engine failure' is the second definition.
'breakdown' can be an answer for 'failure' (I have seen 'Mechanical failure' mean 'breakdown' so perhaps 'failure' could also mean 'breakdown'). I'm not certain of the 'engine' bit.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for breakdown that I've seen before include "Detailed analysis" , "As result of mental stress" , "sudden failure to work" , "Problem with car" , "Analyse" .)