A practice happy families perhaps contest when visiting (4,4)
I believe the answer is:
away game
'contest when visiting' is the definition.
(game visiting another team's ground)
'a practice happy families perhaps' is the wordplay.
'practice' becomes 'way'.
'happy families perhaps' becomes 'game' (happy families is a card game).
'a'+'way'+'game'='AWAY GAME'
(Other definitions for away game that I've seen before include "'It's not played at home (4,4)'" , "match in Brazil?" .)