Business patronage (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
custom
(Other definitions for custom that I've seen before include "''Age cannot wither her, nor ... stale (Antony and Cleopatra)" , "'Habit, practice (6)'" , "Established usage" , "Accepted or habitual practice" , "Traditional usage" .)