Suspicious father in road accident (8)
I believe the answer is:
paranoid
'suspicious' is the definition.
(I've seen this before)
'father in road accident' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'in' is an insertion indicator.
'road' becomes 'rd' (abbreviation).
'accident' becomes 'anoi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rd' enclosing 'anoi' is 'ranoid'.
'pa'+'ranoid'='PARANOID'
Can you help me to learn more?
(Other definitions for paranoid that I've seen before include "Afflicted with delusions of persecution" , "one given to suspicion" , "Suffering from delusions of persecution" , "Paid Nora to have delusions?" , "Excessively suspicious" .)