Something full of holes presenting a problem? (6)
I believe the answer is:
riddle
I believe this is a double definition.
'something full of holes' is the first definition.
(riddle is a type of sieve)
'a problem?' is the second definition.
(riddle is a kind of problem)
'presenting' acts as a link.
(Other definitions for riddle that I've seen before include "Run through" , "Sphinx's conundrum?" , "Cryptic question" , "Cryptic statement" , "it's full of holes" .)