Misfortune I had, in a manner of speaking (8)
I believe the answer is:
'misfortune' is the definition.
(accident is a kind of misfortune)
'i had in a manner of speaking' is the wordplay.
'i had' becomes 'I'd' (contraction).
'in' is an insertion indicator.
'a manner of speaking' becomes 'accent' (accent is a kind of manner of speaking).
'id' inserted within 'accent' is 'ACCIDENT'.
(Other definitions for accident that I've seen before include "Eg, car crash" , "Contretemps" , "Unexpected and unplanned event" , "Mishap, misadventure" , "Dance tic leading to mishap" .)