Clear but not subtle (7)
I believe the answer is:
obvious
I believe this clue is a double definition.
'clear' is the first definition.
(similar in meaning)
'not subtle' is the second definition.
(I've seen this before)
'but' acts as a link.
(Other definitions for obvious that I've seen before include "Perfectly plain and clear" , "Apparent" , "Conspicuous" , "Perfectly plain and easy to understand" , "Patent" .)