Crossword Genius

Mostly employ Union to replace insurgents, initially, after an uprising in submarine (8)

Ross

I believe the answer is:

nautilus

I'm a little stuck... Click here to teach me more about this clue!

'submarine' is the definition.
(nautilus is a kind of submarine)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nautilus that I've seen before include "Nemo's sub (Verne)" , "craft in fiction" , "Spiral-shelled mollusc" , "Sea creature to be found in the usual tin, unusually" , "'Pearly' mollusc" .)

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