Hopefully you are able to solve the questions and reveal the answer. Any constructive comments on this question would be appreciated. Hope you have fun:
1a. 0x53 0x4A Dr from Baker Street
1b. Previously myself, move towards drop off
2a. Also .-. . .-- Operator of a quern-stone
2b. Third most abundant element in the universe
3a. An unknown Doe with a large German glass drinks a Northern English stream.
3b. Belong to pests as well as fellas
4a. Motivation I think therefore quiver with what sounds like fear
4b. His majesty and left initial aside a wax-producing organ
5a. A single beam of light joined the first half of a Pit that was filled in.
5b. An object mischievously approaches