Does it put the voter out of humour? (5)
I believe the answer is:
cross
'out of humour?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cross that I've seen before include "Eg, saltire" , "Thwart, oppose" , "Angry; intersect" , "Get on wrong side of" , "something to be endured" .)