Totalled a large amount (4)
I believe the answer is:
slew
This clue is a double definition.
'totalled' is the first definition.
(past tense of 'slay')
'a large amount' is the second definition.
(slew can mean a large amount of something)
(Other definitions for slew that I've seen before include "Killed - a lot" , "Change direction abruptly" , "making sharp turn" , "twisted position" , "skid" .)