To finish, Wilde names two farm animals in witticism (7)
I believe the answer is:
epigram
'witticism' is the definition.
(I've seen this before)
'to finish wilde names two farm animals' is the wordplay.
'two farm animals' means two substitutions for 'farm animal'.
'to finish' means one lot of letters go next to another (some letters go after or 'finish' others).
'wilde names' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'farm animal' becomes 'pig' (type of farm animal).
'farm animal' becomes 'ram' (male sheep).
'e'+'pig' is 'epig'.
'epig'+'ram'='EPIGRAM'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for epigram that I've seen before include "Quip, witty saying" , "Short, memorable saying" , "Pithy and witty saying" , "Brief witty saying" , "Pithy remark - grim ape (anag)" .)