Refuse to acknowledge row about farm animal (6)
I believe the answer is:
disown
'refuse to acknowledge' is the definition.
(I've seen this before)
'row about farm animal' is the wordplay.
'row' becomes 'din' (both can mean a loud disturbance).
'about' indicates putting letters inside.
'farm animal' becomes 'sow' (I've seen this before).
'din' going around 'sow' is 'DISOWN'.
(Other definitions for disown that I've seen before include "Repudiate - disinherit" , "Repudiate, cast off" , "Wins do (anag)" , "Disclaim or deny" , "Repudiate, disclaim" .)