Asian wearing this runs a risk unnecessarily to some extent (4)
I believe the answer is:
sari
'asian wearing this' is the definition.
(type of Asian garment)
'runs a risk unnecessarily to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'SARI' is hidden in the letters of 'runs a risk unnecessarily'.
(Other definitions for sari that I've seen before include "habit" , "Traditional dress of Hindu women" , "Something worn" , "South Asian garment (variant spelling)" , "Traditional Indian garment" .)