Get through? I don't know (4)
I believe the answer is:
pass
This clue is a double definition.
'get through?' is the first definition.
(getting through is a kind of passing)
'i don't know' is the second definition.
(I've seen this before)
(Other definitions for pass that I've seen before include "Mountain road" , "At Wembley, no shot" , "Exceed; go by" , "Hand over < identity card" , "beats me" .)