Guided munition to fail after vehicle’s overturned (5,4)
I believe the answer is:
smart bomb
'guided munition' is the definition.
I know nothing about this answer so I can't tell whether this works.
'fail after vehicle's overturned' is the wordplay.
'fail' becomes 'bomb' (synonyms).
'after' says to put letters next to each other.
'vehicle's overturned' becomes 'smart' (I can't explain this - if you can you should give a lot more credence to this answer).
'bomb' after 'smart' is 'SMART BOMB'.
'to' is the link.
Can you help me to learn more?
(Other definitions for smart bomb that I've seen before include "You might let me off!" , "Sophisticated weapon" , "Intelligent weapon" .)