Denied having fed pig inside (8)
I believe the answer is:
disowned
'denied having' is the definition.
(I've seen this before)
'fed pig inside' is the wordplay.
'fed' becomes 'dined' (dining is a kind of feeding).
'pig' becomes 'sow' (I've seen this in another clue).
'inside' indicates putting letters inside.
'dined' going around 'sow' is 'DISOWNED'.
(Other definitions for disowned that I've seen before include "cast aside" , "Rejected all connection with on downside" , "Refused to acknowledge (someone)" , "Refused to be linked to (someone or something)" , "Denied having" .)