Fool was confused by overturned vote? That's rubbish (10)
I believe the answer is:
codswallop
'rubbish' is the definition.
(I've seen this before)
'fool was confused by overturned vote?' is the wordplay.
I cannot quite understand how this works, but
'fool' could be 'cod' ('cod' can be a synonym of 'fool') and 'cod' is found in the answer.
an anagram of 'was' is 'swa' which is present in the answer.
This explanation may well be incorrect...
'that's' is the link.
Can you help me to learn more?
(Other definitions for codswallop that I've seen before include "tripe" , "moonshine" , "Baloney" , "Rubbish!" , "Nonsense (colloq.)" .)