Submarine instrument (9)
I believe the answer is:
periscope
(Other definitions for periscope that I've seen before include "overseer" , "Submarine viewing aid" , "Submarine's eye?" , "Submarine's viewer" , "Optical instrument" .)
I believe the answer is:
periscope
(Other definitions for periscope that I've seen before include "overseer" , "Submarine viewing aid" , "Submarine's eye?" , "Submarine's viewer" , "Optical instrument" .)