Driver’s warning was written up as expected (7)
I believe the answer is:
foresaw
'expected' is the definition.
(I've seen this before)
'driver's warning was written up' is the wordplay.
'driver's warning' becomes 'fore' (warning signal in golf - golfers 'drive' balls).
'written up' says the letters should be written in reverse.
'was' back-to-front is 'saw'.
'fore'+'saw'='FORESAW'
'as' acts as a link.
(Other definitions for foresaw that I've seen before include "Anticipated" , "Expected" , "Predicted" .)