Apparently veto a different electoral system (11,4)
I believe the answer is:
alternative vote
'electoral system' is the definition.
(I've seen this before)
'apparently veto a different' is the wordplay.
I cannot really see how this works, but
an anagram of 'veto' is 'evot' which is present in the answer.
'a' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for alternative vote that I've seen before include "AV in full" , "Electoral reform" , "Electoral system" .)