Unobtrusive, circumspect (8)
I believe the answer is:
discreet
I believe this clue is a double definition.
'unobtrusive' is the first definition.
(I've seen this in another clue)
'circumspect' is the second definition.
(I know that circumspect can be written as discreet)
(Other definitions for discreet that I've seen before include "Modest" , "Cautious, doesn't give away secrets" , "Diplomatic" , "Circumspect, considerate" , "Careful in not attracting attention" .)