Delicately complex or understated (6)
I believe the answer is:
subtle
I believe this is a double definition.
'delicately complex' is the first definition.
(I've seen this before)
'understated' is the second definition.
(I've seen this before)
(Other definitions for subtle that I've seen before include "Discreet" , "Delicate, with fine nuances" , "'Fine, elusive (6)'" , "Delicate and understated" , "Highly refined" .)