Not supporting metering system? (7)
I believe the answer is:
counter
I believe this is a double definition.
'not supporting' is the first definition.
(as in counter-revolutionaries)
'metering system?' is the second definition.
(device for counting or metering)
(Other definitions for counter that I've seen before include "one adds" , "Pawn" , "Sales desk" , "Board game disc" , "Trounce (anag.)" .)