Regular attire? (5)
I believe the answer is:
habit
I believe this is a double definition.
'regular' is the first definition.
(I've seen this in another clue)
'attire?' is the second definition.
(habit is a kind of attire)
(Other definitions for habit that I've seen before include "What might one have a regular tendency to" , "It's worn in order" , "Ingrained behaviour" , "Custom; clothing" , "It's second nature" .)