Pig and wild dog not entirely getting on (8)
I believe the answer is:
boarding
'getting on' is the definition.
('board' can be a synonym of 'get on')
'pig and wild dog not entirely' is the wordplay.
'pig' becomes 'boar' (I've seen this before).
'and' means one lot of letters go next to another.
'wild dog' becomes 'dingo' (dingo is a kind of wild dog).
'not entirely' means to remove the last letter.
'dingo' with its last letter taken off is 'ding'.
'boar'+'ding'='BOARDING'
(Other definitions for boarding that I've seen before include "Getting on (a train)" , "Sort of party" , "-- School; -- pass" , "Staying at school" , "Living at school" .)