4 Across, Sprinkle around a bit of liquid? (8)
8 Across, Sounds like you should assume cranky OAP's not fallen for trick (4,1,4,3,2)
10 Across, Old copper becoming investigator in episode's beginning (9)
14 Across, Interrogate and search one that's charged (8)
Compiler - KLINGSOR
Many Thanks.