Usual practice at home (7)
I believe the answer is:
habitat
'home' is the definition.
(thesaurus)
'usual practice at' is the wordplay.
'usual practice' becomes 'habit' (I've seen this before).
'habit'+'at'='HABITAT'
(Other definitions for habitat that I've seen before include "Natural home of an organism" , "Environment in which groups normally live" , "Animal's natural home" , "(Organism's) natural home" , "Surrender" .)