Such problems, presumably, are not pointless (6)
I believe the answer is:
thorny
'such' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for thorny that I've seen before include "Causing difficulty - like a bed of roses?" , "Difficult like briar" , "Covered in spikes" , "Prickly, problematic" , "Tricky" .)