It weighs the remainder (7)
I believe the answer is:
balance
'the remainder' is the definition.
(I know that balance is a type of remainder)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for balance that I've seen before include "Equilibrium or steady position" , "Equilibrium or symmetry" , "Rest" , "Cab lane (anag)" , "Libra - amount in account" .)