Reset meter in old Mitsubishi (4)
I believe the answer is:
zero
'reset' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for zero that I've seen before include "No amount at all" , "terribly cold" , "has no effect, in addition" , "Two minus two" , "Nada" .)