Not obviously stated or displayed (6)
I believe the answer is:
subtle
'not obviously stated or displayed' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for subtle that I've seen before include "Very fine, difficult to perceive or appreciate" , "Not 'in your face'" , "Indirect, difficult to detect" , "Delicate, with fine nuances" , "Delicate, difficult to describe" .)