Saying farm animals are behind the conclusion (7)
I believe the answer is:
epigram
'saying' is the definition.
(I know that epigram is a type of saying)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for epigram that I've seen before include "Concise witty saying" , "Bon mot" , "Witty or sarcastic saying" , "witty comment" , "Gnome" .)