Get rid of wild boar by entrance (8)
I believe the answer is:
abrogate
'get rid of' is the definition.
(abrogating is a kind of getting rid of)
'wild boar by entrance' is the wordplay.
'wild' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'entrance' becomes 'gate' (I've seen this before).
'boar' anagrammed gives 'abro'.
'abro'+'gate'='ABROGATE'
(Other definitions for abrogate that I've seen before include "stop" , "Rescind" , "Abolish formally" , "Annul or revoke" , "Cancel or repeal, say a law" .)