Cursory or nonchalant (6)
I believe the answer is:
casual
I believe this clue is a double definition.
'cursory' is the first definition.
(I know that cursory can be written as casual)
'nonchalant' is the second definition.
(synonyms)
(Other definitions for casual that I've seen before include "Informal or cursory" , "at ease" , "Of clothes, not formal" , "Relaxed - unintentional" , "Type of clothes for leisure time" .)