Times some of the rasher drivers (4)
I believe the answer is:
eras
'times' is the definition.
(era is a kind of time)
'some of the rasher drivers' is the wordplay.
'some of' says the answer is hidden in the clue.
'ERAS' is hidden in the letters of 'the rasher drivers'.
(Other definitions for eras that I've seen before include "At least two times" , "Epochs" , "Periods of time" , "typeface" , "Periods, ages" .)