Disagree, dismissing first total (3-3)
I believe the answer is:
all-out
'total' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for all-out that I've seen before include "Exerting maximum effort - nobody home" , "Nobody home, at top speed" , "Using maximum energy and speed - nobody left at home" , "Using every resource" , "At full speed - no one at home" .)