Crossword Genius

Undersea overseer? (9)

Ross

I believe the answer is:

periscope

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'overseer?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for periscope that I've seen before include "Sub's eye?" , "Optical instrument" , "Submarine viewing aid" , "Viewing instrument in a submarine" , "Submarine's viewer" .)

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