While being unobtrusive, bustle around (6)
I believe the answer is:
subtle
'while being unobtrusive' is the definition.
I can't tell whether this defines the answer.
'bustle around' is the wordplay.
'around' is an anagram indicator.
'bustle' with letters rearranged gives 'SUBTLE'.
Can you help me to learn more?
(Other definitions for subtle that I've seen before include "Very fine, difficult to perceive or appreciate" , "Slight and difficult to detect, like some humour" , "Not immediately obvious, understated" , "Delicate, with fine nuances" , "Such distinctions are hard to see" .)