Vehicle reverses into space, losing bonnet, I predict (6)
I believe the answer is:
oracle
'i predict' is the definition.
'vehicle reverses into space losing bonnet' is the wordplay.
'vehicle reverses' becomes 'rac' (I can't justify this - if you can you should believe this answer much more).
'into' indicates putting letters inside.
'space' becomes 'hole' (hole is a kind of space).
'losing bonnet' means to remove the first letter.
'hole' with its initial letter removed is 'ole'.
'rac' placed inside 'ole' is 'ORACLE'.
(Other definitions for oracle that I've seen before include "Prophet or sage" , "Wise utterance" , "Holy place in ancient times where gods prophesied" , "Where advice or prophecy was sought from the gods in ancient Greece" , "Ancient Greek expounder of wisdom" .)