Involving a mystery whose point is concealed? (5-3-6)
I believe the answer is:
cloak-and-dagger
This clue is a double definition.
'involving a mystery' is the first definition.
(I've seen this before)
'whose point is concealed?' is the second definition.
(I've seen this before)
(Other definitions for cloak-and-dagger that I've seen before include "Involving intrigue and secrecy" , "underground" , "Concerned with intrigue and espionage" .)