Means of weighing what's left over (7)
I believe the answer is:
balance
'means' is the definition.
(thesaurus)
'weighing what's left over' is the wordplay.
I cannot really understand how this works, but
'left' could be 'al' (I've seen this in other clues) and 'al' is found within the answer.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for balance that I've seen before include "Equilibrium or symmetry" , "It weighs - the remainder" , "Libra - amount in account" , "Weighing apparatus" , "Equilibrium or steady position" .)