Not knowing where torch required? (2,3,4)
I believe the answer is:
in the dark
I believe this is a double definition.
'not knowing' is the first definition.
(I've seen this before)
'where torch required?' is the second definition.
(a torch might be needed in darkness)
(Other definitions for in the dark that I've seen before include "when bats might appear" , "Ignorant, unaware" , "Without information" , "overnight" , "Lacking information" .)